Comment 2 for bug 1471333

Reviewed: https://review.openstack.org/198524
Committed: https://git.openstack.org/cgit/openstack/neutron/commit/?id=603c0d03aed5fdeefb471086c0aef879938f9641
Submitter: Jenkins
Branch: master

commit 603c0d03aed5fdeefb471086c0aef879938f9641
Author: Henry Gessau <email address hidden>
Date: Sun Jul 5 03:29:38 2015 -0400

    Support for independent alembic branches in sub-projects

    Sub-projects shall now register their independent alembic migrations
    via entrypoints in setup.cfg, and neutron-db-manage will discover them
    and run them automatically.

    If a service or sub-project is specified explicitly, then
    neutron-db-manage will run on only that service or sub-project.

    The advanced services project are just special cases of sub-projects.
    For example, specifying the CLI option '--service lbaas' is the same
    as specifying '--subproject neutron-lbaas'.

    Specifying no service or sub-project will cause neutron-db-manage to
    run the command on neutron and all installed sub-projects.

    Added and consolidated documentation into devref for alembic migrations.

    Partial-Bug: #1471333
    Partial-Bug: #1470625

    Change-Id: I9a06de64ce35675af28adf819de6f22dc832390d