DNS Locations: adtrustinstance simplify dns management
The path how to get IPA domain in code was somehow obfuscated, this
patch simplifies and make clear what happened there with domain name.
https://fedorahosted.org/freeipa/ticket/2008
Reviewed-By: Petr Spacek <pspacek@redhat.com>
Reviewed-By: Jan Cholasta <jcholast@redhat.com>