Clients that can use ksc Session don't need the old junk to
fake auth anymore:
* compute
* volume
Clients that still need to be fed credentials can pick directly
from the auth object in clientmanager. The _token attribute is
removed, the token can be retrieved from the auth object:
openstackclient/tests/common/test_clientmanager.py
This change will break any plugin that relies on getting a token
from instance._token. They should be updated to use the above, or
preferable, to use keystoneclient.session.Session to create its
HTTP interface object.
Change-Id: I877a29de97a42f85f12a14c274fc003e6fba5135
0de67016c7