ZEPPELIN-1815. Support Spark 2.1#1787

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zjffdu wants to merge 3 commits intoapache:masterfrom

zjffdu:ZEPPELIN-1815

Commits on Dec 21, 2016

ZEPPELIN-1815. Support Spark 2.1
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Commits on Dec 31, 2016

add build with spark 2.1.0
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Commits on Jan 1, 2017

add timeout for connectBackend
zjffdu
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