Comment 25 for bug 1494281

And from the database:

select * from ml2_network_segments;
+--------------------------------------+--------------------------------------+--------------+------------------+-----------------+------------+---------------+
| id | network_id | network_type | physical_network | segmentation_id | is_dynamic | segment_index |
+--------------------------------------+--------------------------------------+--------------+------------------+-----------------+------------+---------------+
| a3aadbf4-92cf-4fd8-ac50-66e27cc6f956 | a71fc5f5-686b-42a6-90c6-5c0d6825da7a | flat | ctlplane | NULL | 0 | 0 |
+--------------------------------------+--------------------------------------+--------------+------------------+-----------------+------------+---------------+