MBean allowing people to register listeners for the controlled processs state.
Doing this via that JMX Facade to the management model isn't viable since
the facade kicks in too late in the startup, which means that the 'jboss.as' and
'jboss.as.expr' domains are not available yet.
This bean gets registered on first load of server, and can be listened to across server restarts
if using an appropriate mechanism (e.g. -javaagent). Note that the typical ways of registering a
listener, either using a remote connector or an internal