Mistake in usage drop_constraint parameters

[Ann Taraday]

In miration 63afba73813_ovs_tunnelendpoints_id_unique mistake in usage drop_constraint parameters tablename and type instead of table_name and type_.

File "/opt/stack/neutron/neutron/db/migration/alembic_migrations/versions/63afba73813_ovs_tunnelendpoints_id_unique.py", line 63, in downgrade
    type='unique'
TypeError: drop_constraint() takes at least 2 arguments (1 given)

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/53064

[Akihiro Motoki (amotoki)]

It occurs when alembic >= 0.5.0.
Alembic 0.5.0 changes the parameter name.

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/53064
Committed: http://github.com/openstack/neutron/commit/9a64271bd9f741b13f6cf4a9074524d3854fdd14
Submitter: Jenkins
Branch: master

commit 9a64271bd9f741b13f6cf4a9074524d3854fdd14
Author: Ann Kamyshnikova <email address hidden>
Date: Tue Oct 22 11:02:55 2013 +0400

    Fix downgrade in migration

    In 63afba73813_ovs_tunnelendpoints_id_unique migration mistake in
    usage drop_constraint parameter type_ and positional agruments name
    and table_name.

    Closes-Bug: #1243073

    Change-Id: I60cd6e7f18b193b71f8f20759251b9f59a79965a