Disable migration sanity check
Disable migration sanity check

Disable the migration sanity check, it has served to wedge deployers
more often than anything and should (instead) issue a warnin that
the deployer should fix their table. Until the real fix is in place
just disable it for any keystone migration.

Change-Id: I210dcc77d188ae3b505dccdac1534184b8443aa9
closes-bug: #1469029

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