Comment 2 for bug 1754104

from https://docs.openstack.org/keystone/latest/install/keystone-install-ubuntu.html

"Before the Queens release, keystone needed to be run on two separate ports to accommodate the Identity v2 API which ran a separate admin-only service commonly on port 35357. With the removal of the v2 API, keystone can be run on the same port for all interfaces."