[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.
Just an FYI, looking at this made me realize that we don't handle the case where this setting gets changed after servers are already running:

https://issues.jboss.org/browse/WFLY-3631