Change invocation of call to keystone middleware for token validation that meets Mitaka expectations.
Change invocation of call to keystone middleware for token validation
that meets Mitaka expectations.

Change-Id: I98bfcec13eba314504c81c45f927cee36f0d5234
Closes-Bug: 1608815

codilime/contrail-controller,codilime/contrail-controller,codilime/contrail-controller,codilime/contrail-controller,codilime/contrail-controller,codilime/contrail-controller