Race condition in SemaphoreConcurrentLinkedQueueManagedConnectionPool

A race condition in the ConnectionListenerWrapper and incorrect logic when returning the ConnectionListener object to the ConcurrentLinkedQueue means that stale field values are sometimes seen for ConnectionListenerWrapper.hasPermit().

Under heavy contention, a stale value in hasPermit() means permits.release() is not called and the semaphores available reduce over time.

The mcp effectively shrinks over time.