neutron-db-manage offline mode requires connection URL

[Jakub Libosvar]

When using offline migration mode with neturon-db-manage, we need to pass config file containing connection string to database. For offline migration is sufficient to know database engine. This and used plugins could be passed directly from command line.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/85988

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/85988
Committed: https://git.openstack.org/cgit/openstack/neutron/commit/?id=de403598f608172b1cf41ca4ec0d880642e215d5
Submitter: Jenkins
Branch: master

commit de403598f608172b1cf41ca4ec0d880642e215d5
Author: Jakub Libosvar <email address hidden>
Date: Tue Apr 8 12:41:11 2014 +0200

    add engine parameter for offline migrations

    Offline migration required config file containing connection string.
    In that case only engine from URL was used. With this patch engine can be
    passed from command line (or config file) along with plugins which sql
    script will be generated accordingly.

    DocImpact

    Change-Id: Ib667a71960b833fd981f97fe7d6b1856084ef5c8
    Closes-Bug: #1304326