PooledInvokerProxy.getPooledConnection() could hold a lock for shorter period of time

I'm seeing Java lock object contention in the org.jboss.invocation.pooled.interfaces.PooledInvokerProxy.getPooledConnection(). I would like to reduce the time that we hold the lock to boost performance. In a load test, we were seeing contention up to 1-2 seconds waiting to get a connection from the pool.

Proposed change to 4.x is attached.