Give some message when an invalid token is in use
Give some message when an invalid token is in use

Give some message when an invalid token is in use (UnsupportedTokenVersionException
is thrown in this case), so end user will know what's happened.

Change-Id: Iba33485b65a334ef1ef8a9b35717af6ba2b7bf5b
Closes-Bug: #1472987

takeshineshiro/keystone,jamielennox/keystone,cernops/keystone,maestro-hybrid-cloud/keystone,mahak/keystone,takeshineshiro/keystone,mahak/keystone,rajalokan/keystone,ajayaa/keystone,mahak/keystone,cernops/keystone,jamielennox/keystone,idjaw/keystone,openstack/keystone,rajalokan/keystone,ilay09/keystone,himanshu-setia/keystone,jonnary/keystone,dims/keystone,maestro-hybrid-cloud/keystone,ilay09/keystone,openstack/keystone,klmitch/keystone,himanshu-setia/keystone,openstack/keystone,ajayaa/keystone,klmitch/keystone,ilay09/keystone,dims/keystone,idjaw/keystone,rajalokan/keystone,roopali8/keystone,jonnary/keystone,roopali8/keystone