Clean up duplicated change-building code in objects

Almost every object thus far has done this:

  changes = {}
  for key in self.obj_what_changed():
      changes[key] = self[key]

to get a dict of updates to apply to the database. This patch adds
that as part of the base object and makes every place that does
the above to just use that.

Change-Id: I847f5d35181b0305668b107f86faa164e71c3375

nova/objects/aggregate.py

@@ -55,9 +55,7 @@ class Aggregate(base.NovaPersistentObject, base.NovaObject):
     @base.remotable
     def create(self, context):
         self._assert_no_hosts('create')
-        updates = {}
-        for key in self.obj_what_changed():
-            updates[key] = self[key]
+        updates = self.obj_get_changes()
         payload = dict(updates)
         if 'metadata' in updates:
             # NOTE(danms): For some reason the notification format is weird
@@ -76,9 +74,7 @@ class Aggregate(base.NovaPersistentObject, base.NovaObject):
     @base.remotable
     def save(self, context):
         self._assert_no_hosts('save')
-        updates = {}
-        for key in self.obj_what_changed():
-            updates[key] = self[key]
+        updates = self.obj_get_changes()
 
         payload = {'aggregate_id': self.id}
         if 'metadata' in updates: