Array based ring, for ketama node locator lookups, for improved performance#9

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tootedom wants to merge 3 commits intocouchbase:masterfrom

tootedom:arraybasedring

Commits on Aug 15, 2015

implement array based ring, and fix concurrency issue in DummyListenableFuture, and allow enough time in Overflow test for reconnect
tootedom
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Commits on Aug 16, 2015