Test / Verify what happens with zookeeper cluster becomes unavailable

[Crim]

Test Procedure

• Start a test topology against a kafka cluster
• Shutdown one or more zookeeper instances backing the cluster
• Determine how the spout responds.
• Start zookeeper instances.

Expected Behavior
It's expected that the spout will gracefully degrade, and once the zk instance becomes available again it correct resumes consuming. If this is NOT what happens, lodge additional issues/work items to correct the behavior.