Disable stale check and nagle

* Apache HTTP's stale conn check causes additionall latency and
  is not recommended for high-throughput/low-latency scenarios.

* Disabling the stale check requires adding a periodic background
  task which clears idles connections.  This prevents the client
  from pulling a conn closed by the server which causes an IOException.

* Disable nagle as it's meant for protocols that use many small messages.