Test to ensure fernet key rotation results in new key sets
Test to ensure fernet key rotation results in new key sets

This amends the existing rotation test to ensure that after each key
rotation, a completely new set of keys exists on disk. This is just a
paranoid test to ensure that the key rotation strategy isn't something
terribly dumb like "shuffle all key files on disk without creating any
new ones."

Change-Id: Ie897bd9d41ff96ed6819cbee0053853701afc9d1

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