Increase the stream drain timeout from 30ms to 100ms.

We were missing out on opportunities to reuse HTTPS connections
with the previous timeout. This even occured on unit tests where
the latency should be very low.

https://github.com/square/okhttp/issues/90
Merge pull request #100 from square/jwilson/longer_recycle_timeouts

Increase the stream drain timeout from 30ms to 100ms.