Migrate existing internal LDAP groups.

Previously, LDAP groups were mirrored in the AccountGroup table and
given an Id and UUID the same as internal groups. Update these groups
to be backed by only a GroupReference, with a special "ldap:" UUID
prefix. Migrate all existing references to the UUID in ownerGroupUUID
and any project.config.

Change-Id: If0b2477a0c6a5c0fc819ebbd56b1998127b60c6f
2 files changed