Change from ReentrantLock to Semaphore so that a different thread can claim or release a TransactionStatus
Change from ReentrantLock to Semaphore so that a different thread can claim or release a TransactionStatus
Fix a small glitch in stress tests
Reinstate TransactionStatus.isLocked and an assert that uses it.
merge pbeaman: Use Semaphore instead of ReentrantLock in TransactionStatus#wwLock.

https://code.launchpad.net/~pbeaman/akiban-persistit/fix-1174352-commit-thread/+merge/161824