Fixes confusing deprecation message
Fixes confusing deprecation message

ldap isn't being deprecated, but ldap assignment is.

Change-Id: I0b4f1d09e4e2ca9e3b9ed759f856fcaac9649ad5
Related-Bug: 1476347

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