GH-1290. Fix barrier bypass in DistributedDoubleBarrier due to spurious wakeups or SyncConnected events#1291
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Fixes GH-1290.
Replace the do { ... } while (false) in internalEnter() with a while (true) loop that re-checks the ZooKeeper children count after every wakeup. This ensures the barrier condition is always verified before returning.
Also removes the hasBeenNotified flag as redundant now that the check is performed in the while loop.