Update token vaalidation  code to match changes in keystone client
Update token vaalidation  code to match changes in keystone
client

Change-Id: I837519e5e7e2c3436f7254127644653a65e27def
Closes-Bug: #1610232

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