BASEV2.__table_args__ is not properly overloaded

[Cedric Brandily]

neutron.db.model_base.BASEV2 defines __table_args__ attribute.
Most of its subclasses overloading __table_args__ does not properly inherit the __table args__ from parent class.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/149731

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/149731
Committed: https://git.openstack.org/cgit/openstack/neutron/commit/?id=0c5d35f37c9767038269d6a9e1a04e742ca925fc
Submitter: Jenkins
Branch: master

commit 0c5d35f37c9767038269d6a9e1a04e742ca925fc
Author: Cedric Brandily <email address hidden>
Date: Fri Jan 23 19:21:24 2015 +0000

    Overload correctly BASEV2.__table_args__

    neutron.db.model_base.BASEV2 defines __table_args__ attribute. Its
    subclasses overloading __table_args__ should inherit __table_args__ from
    parent class.

    A migration script is not needed as __table_args__ are not overloaded in
    neutron.db.migration.models.frozen module.

    Closes-Bug: #1413985
    Change-Id: Ied625252714e2e952f9831d0d03c4573306fe29d