Warnings during server restart/shutdown

See JBEAP-6180, during server restart/shutdown we're observing several warnings, logging some of those doesn't seem necessary.

E.g.

AMQ222002: Timed out waiting for pool to terminate [...]. Interrupting all its threads!

this one is logged because server locator queues a runnable but gets closed before the runnable is executed, seems like in that scenario it shouldn't be executed. There are a few more situations like this where a method starts executing but the server locator gets closed halfway through by a separate thread.