STORM-2666 (1.1.x)#2357

Merged

asfgit merged 3 commits intoapache:1.1.x-branchfrom

srdo:STORM-2666-1.1.x

Oct 9, 2017

Commits on Oct 4, 2017

STORM-2666: Fix storm-kafka-client spout sometimes emitting messages that were already committed. Expand tests, add some runtime validation, minor refactoring to increase code readability. Ensure O…
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Backport to Java 7 and revert changes to RetryService API
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Backport to 1.1.x
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