keystone related arguments need not be passed when openstack is not
the orchestrator, so not referencing this variables before making sure that
the orchestrator is openstack.

Change-Id: I2f94ec68ac27465eb305743c03225825ab21e02f
Partial-Bug: 1378502
Merge "keystone related arguments need not be passed when openstack is not the orchestrator, so not referencing this variables before making sure that the orchestrator is openstack."