DNS Locations: use automatic records update in ipa-adtrust-install
    
    DNS records for adtrust is added by call dns_update_system_records
    
    https://fedorahosted.org/freeipa/ticket/2008
    
    Reviewed-By: Petr Spacek <pspacek@redhat.com>
    Reviewed-By: Jan Cholasta <jcholast@redhat.com>