[SPARK-24225][CORE] Support closing AutoClosable objects in MemoryStore#21322

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JeetKunDoug wants to merge 4 commits intoapache:masterfrom

JeetKunDoug:handle-autoclosable-objects

Commits on May 14, 2018

[SPARK-24225] Support closing AutoClosable objects in MemoryStore so Broadcast Variables can be released properly
JeetKunDoug
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Commits on May 15, 2018

Only close `Broadcast` blocks
JeetKunDoug
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Commits on May 18, 2018