[WFLY-3375] Fix address-setting inheritance

* WildFly address-setting must *not* be created using default values for
its attributes as they will override the values that are inherited using
HornetQ hierarchical repository of address settings.

* add a :resolve operation to the address-setting resource to retrieve
the *resolved* settings (i.e. as resolved by HornetQ after it merged all
the address-settings matching the address). This :resolve operation can
be call on any address-setting address (there is no need for a resource
to exist).

JIRA: https://issues.jboss.org/browse/WFLY-3375