test-migrations: Add django_two_factor migrations to exclude list.

We don't control the names for these migrations.

tools/test-migrations

@@ -8,6 +8,8 @@ new_auto_named_migrations=$(./manage.py showmigrations \
     | grep -E ' [0-9]{4}_auto_' \
     | grep -Eve ' [0-9]{4}_auto_201[67]' \
            -e ' 0052_auto_fix_realmalias_realm_nullable' \
+           -e ' 0003_auto_20150817_1733' \
+           -e ' 0002_auto_20150110_0810' \
  || true)
 if [ "$new_auto_named_migrations" != "" ]; then
     echo "ERROR: New migrations with unclear automatically generated names."