Merge "Add test that checks external tables are not changed"

diff --cc neutron/tests/functional/db/test_migrations.py
index 4e6ac1481d85bf1be75692a27b1d9f5c5dca9ea2,e0a1be07848055b9f77f0af33a3ae7860c86ae25..b8e476073fd03beee91c2ed73e6b4d8978f80b3f
--- 1/neutron/tests/functional/db/test_migrations.py
--- 2/neutron/tests/functional/db/test_migrations.py
+++ b/neutron/tests/functional/db/test_migrations.py
@@@ -13,7 -13,9 +13,8 @@@
  #    under the License.
  
  import functools
 -import logging
  import pprint
+ import six
  
  import alembic
  import alembic.autogenerate