Domain name is needed when using keystone v3 to create keystoneauth
session[1], otherwise the following error will be raised:
InvalidInput: Invalid input received: Expecting to find domain in
project - the server could not comply with the request since it is
either malformed or otherwise incorrect
[1]: https://docs.openstack.org/keystoneauth/latest/authentication-plugins.html#v3-identity-plugins
Change-Id: I557a7107b51ae4ffab15d045a4be6e3ed1940bd8
Closes-bug: #1710570
6139da28da