[WFLY-3108] BZ1076066 Use domain.cached-remote.xml when promoting a backup slave HC to master

Conflicts:
	host-controller/src/main/java/org/jboss/as/host/controller/HostControllerEnvironment.java
Merge pull request #6039 from bstansberry/WFLY-3108

[WFLY-3108] BZ1076066 Use domain.cached-remote.xml when promoting a back...