HORNETQ-1421 Fix MBeans warning on shutdown

Acceptors were previously not being correctly deregristered from JMX and
the management service registry.  This was due to the management service
registry being shutdown before the remoting service had a chance to
deregister the acceptors from it.  This patch shutsdown the remoting
service before the management service to ensure this no longer happens.
Merge pull request #1921 from mtaylor/HORNETQ-1421

HORNETQ-1421 Fix MBeans warning on shutdown