[neutron-lbaas] Migration contains innodb specific code

[Paul Bourke]

The migration contained in neutron_lbaas/db/migration/alembic_migrations/versions/mitaka/expand/6aee0434f911_independent_pools.py drops the foreign key constraints from the lbaas_listeners table. It contains code for both PostgreSQL and MySQL, however, the MySQL path is only compatible with the innodb engine. The ndbcluster engine assigns random names to foreign keys unless told otherwise, resulting in the code erroring out when it tries to reference "lbaas_listeners_ibfk_2". This can be fixed using sqlalchemy's reflection feature to look up the foreign key names before dropping.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/400666

[OpenStack Infra (hudson-openstack)]

Change abandoned by Paul Bourke (pbourke) (<email address hidden>) on branch: master
Review: https://review.openstack.org/400666

[Gregory Thiemonge (gthiemonge)]

Abandoned after re-enabling the Octavia launchpad.