Comment 4 for bug 1273355

Reviewed: https://review.openstack.org/69433
Committed: https://git.openstack.org/cgit/openstack/neutron/commit/?id=d26bd87919990923b6fc85779f03705514d8d0b3
Submitter: Jenkins
Branch: master

commit d26bd87919990923b6fc85779f03705514d8d0b3
Author: Jakub Libosvar <email address hidden>
Date: Mon Jan 27 19:20:51 2014 +0100

    Drop service* tables only if they exist

    Tables servicedefinitions and servicetypes are not used by neutron but
    created using db migration tool. If quantum-server in grizzly was
    started without using migration tool then tables mentioned above are not
    created. During migration from grizzly to havana alembic attempts to
    drop these unused tables. This patch uses "IF EXISTS" clause when
    dropping mentioned tables.

    Closes-bug: #1273355
    Change-Id: I33fcb3e1dc96ce37ec9c00987cb5a3a953ca691d