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Merge branch 'master' into heartbeat
Heartbeat monitoring disabled until first echo request on client.
Support configurable thread count in xio.
Removed finalize() method from storage classes.
Catching all exceptions in SQLTableCachingPolicy sync().
Heartbeat now mandatory.
EchoRequestProtocol echoes immediately from I/O thread.
Only 1 boss thread in xio client and server.
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