[SPARK-18700][SQL] Add StripedLock for each table's relation in cache#16135

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xuanyuanking wants to merge 7 commits intoapache:masterfrom

xuanyuanking:SPARK-18700

Commits on Dec 4, 2016

Commits on Dec 5, 2016

Narrow the range of synchronized
xuanyuanking
committed

Commits on Dec 9, 2016

Simplify the usage of lock and add ut test with metrics
xuanyuanking
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Commits on Dec 11, 2016

Modify var name and comments
xuanyuanking
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Commits on Dec 12, 2016