STORM-2936 Overwrite latest storm-kafka-client 1.x-branch into 1.1.x-branch

* origin commit sha (1.x-branch): 74ca79596c9533b05294ca5de9565ba777b772e9
* overwriting requires small change of storm-core
  * added InterfaceStability
* also overwrote doc and storm-kafka-client-examples as well
54 files changed