Updated openstack/openstack
Project: openstack/keystone  7b88340f9fcea39036a338c19b97bc6a3b945404
null
Correct error class in find_migrate_repo

AssertionError mustn't be used in production code. This complicates error
handling.

Change-Id: I353a2c4cd9b8bb97fffb59918f00dbbf2f326f91