Several fixes in replica_promotion tests
In test_one_command_installation the ipa-replica-install was missing '--server'
and '-U' options which resulted in false negative result. In
test_client_enrollment_by_unprivileged_user '--server' option was messing.
test_replica_promotion_after_adding_to_admin_group lacked '-U' option. It
leaded to 3 failed cases.
https://fedorahosted.org/freeipa/ticket/6301
Reviewed-By: Martin Basti <mbasti@redhat.com>