Merge pull request #161 from claco/v4.2.2rc

Merged automatically by jenkins after successful build test
Split Identity and Assignment in keystone so that for AD/LDAP deployments user information comes from the external source, and roles/tenants/domains come from mysql controlled by openstack
Merge pull request #163 from rackerjoe/v4.2.2rc

Merged automatically by jenkins after successful build test