Invalid arguments in a migration method call.

[Ilya Pekelny]

Migration method called with incorrect parameters for MySQL database engine.

     op.drop_constraint("uniq_nodes0instance_uuid", "nodes")

http://alembic.readthedocs.org/en/latest/ops.html#alembic.operations.Operations.drop_constraint

> optional, required on MySQL. can be ‘foreignkey’, ‘primary’, ‘unique’, or ‘check’.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/112896

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/112896
Committed: https://git.openstack.org/cgit/openstack/ironic/commit/?id=480df3fd8cc55d926c8167891ce46670d79b82bc
Submitter: Jenkins
Branch: master

commit 480df3fd8cc55d926c8167891ce46670d79b82bc
Author: Ilya Pekelny <email address hidden>
Date: Fri Aug 8 17:07:53 2014 +0300

    Correct `op.drop_constraint` parameters

    `drop_constraint` method require `type_` parameter, when called with
    MySQL.

    > type_ – optional, required on MySQL. can be "foreignkey", "primary",
    "unique", or "check".

    Change-Id: I069a74ea60ba678fb128f27858db169f4dac89a6
    Closes-Bug: #1354463