do not force interface=admin for identity api v3
do not force interface=admin for identity api v3

In some places we were forcing interface=admin for identity api v3
connections, which is not necessary and can cause unexpected problems
when the caller was explicitly trying to interact with the public or
internal api endpoints.

Story: #2004422
Task: #28074
Change-Id: Ib142be68ad7c2acce3a5daee4cb9aea141a4dc71

openstack/python-openstacksdk,stackforge/python-openstacksdk,dtroyer/python-openstacksdk,dtroyer/python-openstacksdk,openstack/python-openstacksdk,stackforge/python-openstacksdk