With one-way trust we cannot rely on cross-realm TGT as there will be none. Thus, if we have AD administrator credentials we should reuse them. Additionally, such use should be done over Kerberos. Fixes: https://fedorahosted.org/freeipa/ticket/4960 https://fedorahosted.org/freeipa/ticket/4959 Reviewed-By: Tomas Babej <tbabej@redhat.com>