Updated openstack/openstack
Project: openstack/keystone  cfccc98d0073cd88e4fd1d6285fda30f89e47200
null
Fix assignment to not require user or group existence

The assignment code was requiring the existence of users and
groups before performing different operations. With federation,
the users and groups may legitimately not be defined in keystone,
so these checks cannot be done.

Implements: bp no-check-id
Change-Id: Ib9d0188ae2a436617bad90bf936e7b3dbf296885