Remove incorrect FusedFuture impl on Delay (#1652)

`is_terminated` must return `true` until the future has been polled at least once to make sure that the associated block in select is called even after the delay has elapsed.

You use `Delay` in a `select!` by [fusing it](https://docs.rs/futures-preview/0.3.0-alpha.19/futures/future/trait.FutureExt.html#method.fuse):

```rust
let delay = tokio::timer::delay(/* ... */);
let delay = delay.fuse();

select! {
    _ = delay => {
        /* work here */
    }
}
```

0 files changed, 0 insertions, 0 deletions