Hack to support old and new stevedore
Hack to support old and new stevedore

See Id675f335957a95fcfce61934dfbfbb2c64af761a, the
_find_entry_points is now list_entry_points.

We should be using extension.ExtensionManager.make_test_instance
to set up the extensions like the one in:
Ie9af444e7f8842ffb3e275ede52b802de02e6e99

Just to get past the problem we have merging stevedore
upper constraints, filing this review

Change-Id: I141b17f9dd2acebe2b23f8fc93206e23bc70b568

openstack/glance,rajalokan/glance,rajalokan/glance,openstack/glance,openstack/glance