[WFLY-490] / [WFLY-2220] Ensure the RBAC configuration is reset on starting the server service so that all updates can be applied again.

This was leading to the following error on reload: -

java.lang.UnsupportedOperationException
	at java.util.Collections$UnmodifiableMap.put(Collections.java:1342) [rt.jar:1.7.0_17]

However the real meaning was that the runtime state had not been reset to allow it to be repopulated as the server process starts.