Add revocation extension to default pipeline
Add revocation extension to default pipeline

Since this extension will have an impact across many projects
within OpenStack, it should be on by default.

Change-Id: Id9ff5e4e22125c54b5793bc42819fb4d1ef6dc90

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