Remove redundant codes from FunctionalTest class

[Hua Wang]

No codes use SOURCE_DATA, and dbapi has been set in the setUp function in base class.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/204969

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/204969
Committed: https://git.openstack.org/cgit/openstack/magnum/commit/?id=e0d96cfd431ef2c9ae479814ae3d0161429d55ee
Submitter: Jenkins
Branch: master

commit e0d96cfd431ef2c9ae479814ae3d0161429d55ee
Author: Hua Wang <email address hidden>
Date: Thu Jul 16 05:40:28 2015 +0800

    Remove redundant code from FunctionalTest class

    No code references SOURCE_DATA, and dbapi has been set in the setUp
    function in base class.

    Change-Id: I27e11628a9127af20de1a29545f04f876349c79e
    Closes-Bug: #1477465