e180a98094
1. Now, the vitrage use [service_credentials] to get credentials[0],
remove the unused [keystone_authtoken]
2. Move memcache stuff into service_credentials section
[0]: 5c4bd36e80/vitrage/opts.py (L56)
Change-Id: Id22e59ff572a2fef08906bf6cc48578981d2efd6