Ensure constant order when setting all image tags
Ensure constant order when setting all image tags

The newer version of tox (>=1.7.0) sets a random hash seed, which makes the
order of sets unpredictable. This patchset fixes the test_image_tag_set_all
test, which otherwise broke with a randomized PYTHONHASHSEED. This new tox
behaviour is consistent with python (>=3.3), meaning this change should avoid
bugs on that platform at a later date.

Change-Id: Ie281b04fc9c4c2a96a9eec9bde7b05229ebf57fc
Partial-bug: #1348818

scripnichenko/glance,wkoathp/glance,scripnichenko/glance,stevelle/glance,redhat-openstack/glance,akash1808/glance,takeshineshiro/glance,takeshineshiro/glance,redhat-openstack/glance,openstack/glance,sigmavirus24/glance,kfwang/Glance-OVA-OVF,paramite/glance,vuntz/glance,kfwang/Glance-OVA-OVF,klmitch/glance,openstack/glance,JioCloud/glance,jumpstarter-io/glance,dims/glance,paramite/glance,rajalokan/glance,openstack/glance,rajalokan/glance,sigmavirus24/glance,saeki-masaki/glance,vuntz/glance,darren-wang/gl,dims/glance,akash1808/glance,wkoathp/glance,ozamiatin/glance,jumpstarter-io/glance,saeki-masaki/glance,JioCloud/glance,stevelle/glance,klmitch/glance,ozamiatin/glance,darren-wang/gl