Heal migration fails if MySQL is using MyISAM engine

[Ann Taraday]

If in MySQL default engine is set to MyISAM, heal migration fails with such error log http://paste.openstack.org/show/87625/

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/108731

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/109253

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/109253
Committed: https://git.openstack.org/cgit/openstack/neutron/commit/?id=808452913af090009ee1a32235bdd0b52b4e6e5c
Submitter: Jenkins
Branch: master

commit 808452913af090009ee1a32235bdd0b52b4e6e5c
Author: Ann Kamyshnikova <email address hidden>
Date: Thu Jul 24 14:33:02 2014 +0400

    Set InnoDB engine for all existing tables

    Added the method in heal script that checks if mysql_engine
    parameter is needed to be changed and if it is neseccary do this.
    Also this change adds migation that set 'mysql_engine' to InnoDB
    for all tables that were added into the database after healing.

    Closes-bug: #1346966

    Change-Id: Ia4d9038b99b2559d37272a17f5819a9dedd53f72