DB: Some tables still explicitly set mysql_engine

[Salvatore Orlando]

After commit commit 466e89970f11918a809aafe8a048d138d4664299 migrations should not anymore explicitly specify the engine used for mysql.

There are still some migrations which do that, and they should be amended.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/116592

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/116592
Committed: https://git.openstack.org/cgit/openstack/neutron/commit/?id=25f117bacf1cb110260d96e764ae8fac9440c14e
Submitter: Jenkins
Branch: master

commit 25f117bacf1cb110260d96e764ae8fac9440c14e
Author: Salvatore Orlando <email address hidden>
Date: Mon Aug 25 04:52:49 2014 -0700

    Do not explicitly set mysql_engine

    Setting the mysql_engine when creating a table is not needed
    anymore as this is automatically done by an event listener
    added with commit 466e89970f11918a809aafe8a048d138d4664299

    Change-Id: I0df978dbf2bb44f17102da3c17fd4e93c9e4df8d
    Closes-Bug: #1361176