Remove obj_relationships from objects

In Liberty, we converted to using the manifest-based class
action and backport methods, which no longer rely on these
object relationship maps. They provide a full manifest of
client-side versions with each call, which is far more
robust than us trying to hand-edit these mappings (which
we get incorrect a lot).

Since we're now in Mitaka, we can drop compatibility with
clients that don't make the version-manifest calls. Those
have also been deprecated in oslo.versionedobjects.

Change-Id: Iea8b6348e3b01aaa335ec5408f07826f1e758d20

nova/objects/instance_fault.py

@@ -101,10 +101,6 @@ class InstanceFaultList(base.ObjectListBase, base.NovaObject):
     fields = {
         'objects': fields.ListOfObjectsField('InstanceFault'),
         }
-    # NOTE(danms): InstanceFault was at 1.1 before we added this
-    obj_relationships = {
-        'objects': [('1.0', '1.1'), ('1.1', '1.2')],
-        }
 
     @base.remotable_classmethod
     def get_by_instance_uuids(cls, context, instance_uuids):