Add __repr__ to KeystoneToken model
Add __repr__ to KeystoneToken model

For better debugging/usability, add __repr__ to the KeystoneToken model.

Change-Id: I76fc0dd416e074170ad8a0874655eaae20e3c293

promptworks/keystone,jumpstarter-io/keystone,cernops/keystone,rajalokan/keystone,rajalokan/keystone,klmitch/keystone,jumpstarter-io/keystone,jonnary/keystone,openstack/keystone,rushiagr/keystone,rushiagr/keystone,UTSA-ICS/keystone-kerberos,dstanek/keystone,takeshineshiro/keystone,UTSA-ICS/keystone-kerberos,himanshu-setia/keystone,blueboxgroup/keystone,nuxeh/keystone,vivekdhayaal/keystone,ajayaa/keystone,jumpstarter-io/keystone,mahak/keystone,jamielennox/keystone,MaheshIBM/keystone,dims/keystone,mahak/keystone,MaheshIBM/keystone,idjaw/keystone,roopali8/keystone,klmitch/keystone,ging/keystone,idjaw/keystone,himanshu-setia/keystone,rajalokan/keystone,jonnary/keystone,maestro-hybrid-cloud/keystone,rushiagr/keystone,dstanek/keystone,nuxeh/keystone,dims/keystone,openstack/keystone,roopali8/keystone,promptworks/keystone,ilay09/keystone,ilay09/keystone,nuxeh/keystone,maestro-hybrid-cloud/keystone,jamielennox/keystone,ajayaa/keystone,vivekdhayaal/keystone,vivekdhayaal/keystone,ilay09/keystone,cernops/keystone,blueboxgroup/keystone,mahak/keystone,promptworks/keystone,openstack/keystone,dstanek/keystone,takeshineshiro/keystone,ging/keystone