update to use openstack-common 0.4.0

Change-Id: Iea586189ef0e999b6e5893b2f4f7ffadfb3d4ce7
Fixes auth token config settings

Per discussion on LP 1207504, this patch fixes
the auth_token middleware configuration settings
for the Glance API server

Change-Id: I968c73b90cab3ec0fad49e2309fa6d2136bbc392