Use the correct auth_plugin for token authentication
Use the correct auth_plugin for token authentication

Use ksc_auth.token_endpoint.Token as Keystone authentication plugin if
auth_type is token_endpoint.

Change-Id: I1a6d6dfe731527d7040cfbc2404fd5cf86ba5893

openstack/python-openstacksdk,openstack/os-client-config,dtroyer/python-openstacksdk,redhat-openstack/os-client-config,dtroyer/python-openstacksdk,dtroyer/os-client-config,switch-ch/os-client-config,stackforge/python-openstacksdk,openstack/python-openstacksdk,stackforge/python-openstacksdk