[WFLY-3565], fix incorrect use of ReloadRequiredWriteAttributeHandler inside host resources.

https://issues.jboss.org/browse/WFLY-3565
fix incorrect use of ReloadRequiredWriteAttributeHandler inside host resources.
These need to execute with RunningMode.ADMIN_ONLY. The security realm services are part of what's available in ADMIN_ONLY, as the management interfaces must be secured.