Bug #787296: test_walk_versions fails with SQLalchemy 0.7
Bug #787296: test_walk_versions fails with SQLalchemy 0.7

Cap SQLalchemy and sqlalchemy-migrate at 0.6.x.  This works around the
problem where test_walk_versions fails with 0.7.

It's obviously not a long-term fix.
dims/glance,stevelle/glance,openstack/glance,citrix-openstack-build/glance,rajalokan/glance,redhat-openstack/glance,openstack/glance,takeshineshiro/glance,dims/glance,scripnichenko/glance,rickerc/glance_audit,paramite/glance,JioCloud/glance,saeki-masaki/glance,stevelle/glance,ntt-sic/glance,kfwang/Glance-OVA-OVF,saeki-masaki/glance,wkoathp/glance,klmitch/glance,ozamiatin/glance,kfwang/Glance-OVA-OVF,JioCloud/glance,darren-wang/gl,cloudbau/glance,ntt-sic/glance,wkoathp/glance,darren-wang/gl,vuntz/glance,rickerc/glance_audit,redhat-openstack/glance,sigmavirus24/glance,rajalokan/glance,jumpstarter-io/glance,takeshineshiro/glance,citrix-openstack-build/glance,scripnichenko/glance,tanglei528/glance,klmitch/glance,SUSE-Cloud/glance,akash1808/glance,cloudbau/glance,paramite/glance,jumpstarter-io/glance,vuntz/glance,tanglei528/glance,sigmavirus24/glance,openstack/glance,ozamiatin/glance,akash1808/glance,SUSE-Cloud/glance