Incorrect usage of drop_constraint in 2a1ee2fb59e0 migration

[Ann Taraday]

Downgrade for migration 2a1ee2fb59e0_add_mac_address_unique_constraint fails as it gets wrong parameters name, source and local_cols, although it expects name, source and type_ http://alembic.readthedocs.org/en/latest/ops.html#alembic.operations.Operations.drop_constraint

Error - http://paste.openstack.org/show/172906/

Also as MySQL create index for unique constraint it should be used "with migration.remove_fks_from_table", as it gets an error - http://paste.openstack.org/show/172907/

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/155737

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/155737
Committed: https://git.openstack.org/cgit/openstack/neutron/commit/?id=77c073b743a257781b068552ca2af175c4c2cd30
Submitter: Jenkins
Branch: master

commit 77c073b743a257781b068552ca2af175c4c2cd30
Author: Ann Kamyshnikova <email address hidden>
Date: Fri Feb 13 15:52:49 2015 +0300

    Fix usage drop_constraint in 2a1ee2fb59e0 migration

    Downgrade for migration 2a1ee2fb59e0_add_mac_address_unique_constraint
    fails as it gets wrong parameters name, source and local_cols,
    although it expects name, source and type_.

    Also as MySQL creates index for unique constraint it should be used
    "with migration.remove_fks_from_table".

    Closes-bug: #1421631

    Change-Id: Id86b2f339a6fb33fc4fd637ffbfc2cb6e75ef4fb