This refactors resource dependencies to improve the following points.
- Avoid unnecessary dependencies across services. For example aodh
service does not require cinder db.
- Restart keystone on change in uwsgi only when a standalone service
is used. uwsgi config is not used when keystone is run by apache.
Change-Id: Ic4f43215ea90c6b71fe4225e2dfa6a6a3abf6869