Updated openstack/openstack
Project: openstack/glance  3428e6d637896690164b0a08d3dd3852b0c3c560
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Update glance/opensatck/common from oslo Part 3

Update from oslo:
- glance/openstack/common/fixture
- glance/openstack/common/test.py

And update openstack-common.conf

Oslo commit: 764ad35e89d20008bf48d17e4129cfce5b717a6c

Change-Id: Ic20666521e2e3d4241035bcb07fa7da3a4a5bf38