Merged in [9715] from rcross@amsl.com:

Update merge-person script to handle contraints and roles.
 - Legacy-Id: 9724
Note: SVN reference [9715] has been migrated to Git commit 5dfe492cfb

ietf/bin/merge-person-records

@@ -61,6 +61,16 @@ for message in source.message_set.all():
     message.by = target
     message.save()
 
+# merge Constraints
+for constraint in source.constraint_set.all():
+    constraint.person = target
+    constraint.save()
+
+# merge Roles
+for role in source.role_set.all():
+    role.person = target
+    role.save()
+
 # check for any remaining relationships and delete if none
 objs = [source]
 opts = Person._meta