Add ModelSMigrationSync classes
Add ModelSMigrationSync classes

Add classes for testing correspondence between migration scripts
and metadata.
We need oslotest in test-requirements due to bug#1356425

Partial-Bug: #1365436
Change-Id: I0db68ea3557dd9d214ea50ff7c96de1a47a58d4b

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