XD-124 Suppress Redis interrupted exceptions on shutdown

Shutting down the listener task in the
RedisQueueInboundChannelAdapter often results in
CommandInterruptedExceptions from Lettuce. Don't
show these stack traces on container shutdown.
Merge pull request #28 from jencompgeek/XD-124

* jencompgeek-XD-124:
  XD-124 Suppress Redis interrupted exceptions on shutdown