Adding this example conf file would guide user to set correct host
name in AIO case. An experimental test for barbican has been added
which uses the barbican tempest plugin.
Depends-On: https://review.openstack.org/596408
Depends-On: https://review.openstack.org/596541
Change-Id: I10a07d5e4b2b3fbf122a79f15e27a9ca34799221