Comment 2 for bug 1327397

Reviewed: https://review.openstack.org/98504
Committed: https://git.openstack.org/cgit/openstack/ironic/commit/?id=f9c7e4344a49a37edbb575e0b37254a8714d1d38
Submitter: Jenkins
Branch: master

commit f9c7e4344a49a37edbb575e0b37254a8714d1d38
Author: Devananda van der Veen <email address hidden>
Date: Fri Jun 6 12:42:00 2014 -0700

    Skip migrations test_walk_versions instead of pass

    When there is no db engine configured for the migration tests,
    the test_walk_versions test was passing, rather than skipping,
    because it contained a for-loop and no check for the length of the
    sequence being iterated over.

    This patch checks the length of the configured engines and
    properly skips the test when there are no engines.

    Change-Id: I8a5c0a66f65a99c5169b251be02a8fbe6c727641
    Closes-bug: #1327397