Driver HA support using WriteAheadLog#14

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tdas wants to merge 12 commits intodriver-hafrom

driver-ha-working

Commits on Oct 4, 2014

Commits on Oct 6, 2014

Added checkpoint data of ReceiverInputDStream, improved WALManager, refactored WALSuite.
tdas
committed

Commits on Oct 7, 2014

Improved WALSuite, and added ReceivedBlockHandlerSuite.
tdas
committed

Commits on Oct 8, 2014

Added ReceiverTrackerSuite
tdas
committed

Commits on Oct 21, 2014

Added ReceivedBlockTracker to track all block metadata related actions. Updated ReceivedBlockTrackerSuite, and DriverFailureSuite.
tdas
committed
Moved around packages.
tdas
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