Description of problem:
If a slave Host Controller is started with --admin-only and it's host.xml has the admin-only-policy="fetch-from-master" set, the slave cannot connect to the master to get the domain wide configuration.
This prevents the --admin-only slave using RBAC unless a copy of the domain-wide configuration file is stored locally as domain.cached-remote.xml and the slave is started with --cached-dc.
Steps to Reproduce:
1. Add the admin-only-policy="fetch-from-master" attribute to the domain-controller/remote element in a slave Host Controller's host config xml file.
2. Start the slave with the --admin-only option.
The slave fails to start.
The slave should start, including connecting to the master to pull down the domain wide configuration.
Verified on EAP 6.3.0.ER8