mysql module add ssl connection support (#5610)

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##### Summary

Fixes: #5608 

Add ssl connection support to MySQLService

> python-mysqlclient connection

```
        :param dict ssl:                                                                            
            dictionary or mapping contains SSL connection parameters;                               
            see the MySQL documentation for more details                                            
            (mysql_ssl_set()).  If this is set, and the client does not                             
            support SSL, NotSupportedError will be raised.
```

[SSL connection parameters:](https://dev.mysql.com/doc/refman/5.6/en/mysql-ssl-set.html)

 - **key**: The path name of the client private key file.
 - **cert**: The path name of the client public key certificate file.
 - **ca**: The path name of the Certificate Authority (CA) certificate file. This option, if used, must specify the same certificate used by the server.
 - **capath**: The path name of the directory that contains trusted SSL CA certificate files.
 - **cipher**: The list of permitted ciphers for SSL encryption.

##### Component Name

[`collectors/python.d.plugin/python_modules/bases/FrameworkServices/MySQLService`](https://github.com/netdata/netdata/blob/master/collectors/python.d.plugin/python_modules/bases/FrameworkServices/MySQLService.py)

___

@woosley please test it

```yaml
tcp:
  name     : 'local'
  user     : 'user'
  pass     : 'pass'
  host     : 'localhost'
  port     : '3306'
  ssl:
    key:   'path/to/key'
    cert:  'path/to/cet'
    ca:    'path/to/ca'
```

3 files changed, 200 insertions, 11 deletions

diff --git a/collectors/python.d.plugin/mysql/README.md b/collectors/python.d.plugin/mysql/README.md
index 498493a3f5..eba9d7a2e5 100644
--- a/collectors/python.d.plugin/mysql/README.md
+++ b/collectors/python.d.plugin/mysql/README.md
@@ -7,7 +7,7 @@ Module monitors one or more mysql servers
 
 It will produce following charts (if data is available):
 
-1. **Bandwidth** in kbps
+1. **Bandwidth** in kilobits/s
  * in
  * out
 
@@ -16,9 +16,15 @@ It will produce following charts (if data is available):
  * questions
  * slow queries
 
-3. **Operations** in operations/sec
- * opened tables
- * flush
+3. **Queries By Type** in queries/s
+ * select
+ * delete
+ * update
+ * insert
+ * cache hits
+ * replace
+
+4. **Handlerse** in handlers/s
  * commit
  * delete
  * prepare
@@ -26,29 +32,192 @@ It will produce following charts (if data is available):
  * read key
  * read next
  * read prev
- * read random
- * read random next
+ * read rnd
+ * read rnd next
  * rollback
- * save point
+ * savepoint
+ * savepoint rollback
  * update
  * write
 
-4. **Table Locks** in locks/sec
+4. **Table Locks** in locks/s
  * immediate
  * waited
 
-5. **Select Issues** in issues/sec
+5. **Table Select Join Issuess** in joins/s
  * full join
  * full range join
  * range
  * range check
  * scan
 
-6. **Sort Issues** in issues/sec
+6. **Table Sort Issuess** in joins/s
  * merge passes
  * range
  * scan
 
+7. **Tmp Operations** in created/s
+ * disk tables
+ * files
+ * tables
+
+8. **Connections** in connections/s
+ * all
+ * aborted
+
+9. **Connections Active** in connections/s
+ * active
+ * limit
+ * max active
+
+10. **Binlog Cache** in threads
+ * disk
+ * all
+
+11. **Threads** in transactions/s
+ * connected
+ * cached
+ * running
+
+12. **Threads Creation Rate** in threads/s
+ * created
+
+13. **Threads Cache Misses** in misses
+ * misses
+
+14. **InnoDB I/O Bandwidth** in KiB/s
+ * read
+ * write
+
+15. **InnoDB I/O Operations** in operations/s
+ * reads
+ * writes
+ * fsyncs
+
+16. **InnoDB Pending I/O Operations** in operations/s
+ * reads
+ * writes
+ * fsyncs
+
+17. **InnoDB Log Operations** in operations/s
+ * waits
+ * write requests
+ * writes
+
+18. **InnoDB OS Log Pending Operations** in operations
+ * fsyncs
+ * writes
+
+19. **InnoDB OS Log Operations** in operations/s
+ * fsyncs
+
+20. **InnoDB OS Log Bandwidth** in KiB/s
+ * write
+
+21. **InnoDB Current Row Locks** in operations
+ * current waits
+
+22. **InnoDB Row Operations** in operations/s
+ * inserted
+ * read
+ * updated
+ * deleted
+
+23. **InnoDB Buffer Pool Pagess** in pages
+ * data
+ * dirty
+ * free
+ * misc
+ * total
+
+24. **InnoDB Buffer Pool Flush Pages Requests** in requests/s
+ * flush pages
+
+25. **InnoDB Buffer Pool Bytes** in MiB
+ * data
+ * dirty
+
+26. **InnoDB Buffer Pool Operations** in operations/s
+ * disk reads
+ * wait free
+
+27. **QCache Operations** in queries/s
+ * hits
+ * lowmem prunes
+ * inserts
+ * no caches
+
+28. **QCache Queries in Cache** in queries
+ * queries
+
+29. **QCache Free Memory** in MiB
+ * free
+
+30. **QCache Memory Blocks** in blocks
+ * free
+ * total
+
+31. **MyISAM Key Cache Blocks** in blocks
+ * unused
+ * used
+ * not flushed
+
+32. **MyISAM Key Cache Requests** in requests/s
+ * reads
+ * writes
+
+33. **MyISAM Key Cache Requests** in requests/s
+ * reads
+ * writes
+
+34. **MyISAM Key Cache Disk Operations** in operations/s
+ * reads
+ * writes
+
+35. **Open Files** in files
+ * files
+
+36. **Opened Files Rate** in files/s
+ * files
+
+37. **Binlog Statement Cache** in statements/s
+ * disk
+ * all
+
+38. **Connection Errors** in errors/s
+ * accept
+ * internal
+ * max
+ * peer addr
+ * select
+ * tcpwrap
+
+39. **Slave Behind Seconds** in seconds
+ * time
+
+40. **I/O / SQL Thread Running State** in bool
+ * sql
+ * io
+
+41. **Replicated Writesets** in writesets/s
+ * rx
+ * tx
+
+42. **Replicated Bytes** in KiB/s
+ * rx
+ * tx
+
+43. **Galera Queue** in writesets
+ * rx
+ * tx
+
+44. **Replication Conflicts** in transactions
+ * bf aborts
+ * cert fails
+
+45. **Flow Control** in ms
+ * paused
+
 ### configuration
 
 You can provide, per server, the following:
@@ -59,7 +228,13 @@ You can provide, per server, the following:
 4. mysql socket (optional)
 5. mysql host (ip or hostname)
 6. mysql port (defaults to 3306)
-
+7. ssl connection parameters
+ - key: the path name of the client private key file.
+ - cert: the path name of the client public key certificate file.
+ - ca: the path name of the Certificate Authority (CA) certificate file. This option, if used, must specify the same certificate used by the server.
+ - capath: the path name of the directory that contains trusted SSL CA certificate files.
+ - cipher: the list of permitted ciphers for SSL encryption.
+ 
 Here is an example for 3 servers:
 
 ```yaml
diff --git a/collectors/python.d.plugin/mysql/mysql.conf b/collectors/python.d.plugin/mysql/mysql.conf
index ac9b505bcd..31bfe9c026 100644
--- a/collectors/python.d.plugin/mysql/mysql.conf
+++ b/collectors/python.d.plugin/mysql/mysql.conf
@@ -73,6 +73,14 @@
 #     user: 'username'       # the mysql username to use
 #     pass: 'password'       # the mysql password to use
 #
+#  ssl connection parameters
+#
+#  ssl:
+#    key:    'key'      # the path name of the client private key file.
+#    cert:   'cert'     # the path name of the client public key certificate file.
+#    ca:     'ca'       # the path name of the Certificate Authority (CA) certificate file. This option, if used, must specify the same certificate used by the server.
+#    capath: 'capath'   # the path name of the directory that contains trusted SSL CA certificate files.
+#    cipher: [ciphers]  # the list of permitted ciphers for SSL encryption.
 
 # ----------------------------------------------------------------------
 # mySQL CONFIGURATION
diff --git a/collectors/python.d.plugin/python_modules/bases/FrameworkServices/MySQLService.py b/collectors/python.d.plugin/python_modules/bases/FrameworkServices/MySQLService.py
index 9a694aa825..a09041ca48 100644
--- a/collectors/python.d.plugin/python_modules/bases/FrameworkServices/MySQLService.py
+++ b/collectors/python.d.plugin/python_modules/bases/FrameworkServices/MySQLService.py
@@ -44,6 +44,7 @@ class MySQLService(SimpleService):
                 properties['user'] = conf['user']
             if conf.get('pass'):
                 properties['passwd'] = conf['pass']
+
             if conf.get('socket'):
                 properties['unix_socket'] = conf['socket']
             elif conf.get('host'):
@@ -51,9 +52,14 @@ class MySQLService(SimpleService):
                 properties['port'] = int(conf.get('port', 3306))
             elif conf.get('my.cnf'):
                 if MySQLdb.__name__ == 'pymysql':
+                    # TODO: this is probablt wrong, it depends on version
                     self.error('"my.cnf" parsing is not working for pymysql')
                 else:
                     properties['read_default_file'] = conf['my.cnf']
+
+            if conf.get('ssl'):
+                properties['ssl'] = conf['ssl']
+
             if isinstance(extra_conf, dict) and extra_conf:
                 properties.update(extra_conf)