Updated openstack/openstack
Project: openstack/glance  fed99f95948f2069f6b8fc91c65621c155d08ed4

Replace custom lazy loading by stevedore

Now we have own implementation for loading
extensions. stevedore avoids creating yet
another extension mechanism by building on
top of setuptools entry points.

Change-Id: I7fcb981b58b20fb49d10eea3d477f962e4bf3565