[SPARK-5147][Streaming] Delete the received data WAL log periodically#4149

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tdas wants to merge 4 commits intoapache:masterfrom

tdas:SPARK-5147

Commits on Jan 14, 2015

Delete the old WAL log periodically
jerryshao
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Commits on Jan 21, 2015

Refactored the fix to make sure that the cleanup respects the remember duration of all the receiver streams
tdas
committed

Commits on Jan 22, 2015

Minor fixes
tdas
committed
Added comments.
tdas
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