[OC4.0] add opencontrail admin

In order to stop using shared credentials a
separate contrail admin user has to be created.
For contrail services this user will be used.
PROD-23356
Generation of unused files (keystonerc, openstackrc
and ctrl-details) has been removed from common.sls.

Change-Id: I6efe241d27a68b5f277bd43909e11c28ad027ace
12 files changed