Migrated netty to 4.x#116

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ooasis wants to merge 5 commits intoOpenTSDB:nextfrom

Commits on May 6, 2016

Migrated netty to 4.x

cm-cnnxty
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Netty 4.0: optimized ByteBuf allocation for IO

cm-cnnxty
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ooasis
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Netty 4.0: more optimization on buffer allocation

cm-cnnxty
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ooasis
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Netty 4.0: fixed unit tests for jdk6

cm-cnnxty
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ooasis
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Migrated netty to 4.x: rebased to 1.8.0-SNAPSHOT and fixed the merge error
ooasis
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