Comment 6 for bug 1498573

Reviewed: https://review.openstack.org/236082
Committed: https://git.openstack.org/cgit/openstack/trove/commit/?id=1c819c3e37e6019464ed59d90bf3d8c83581202d
Submitter: Jenkins
Branch: master

commit 1c819c3e37e6019464ed59d90bf3d8c83581202d
Author: Matt Van Dijk <email address hidden>
Date: Wed Oct 14 14:47:11 2015 -0400

    Improve guestagent datastore models

    All validation of requests is currently done against the MySQL datastore
    models. In order to switch to using datastore extensions for validation
    the models need to be refactored.

    The current approach to guestagent/db/models.py is getting unruly and
    is difficult to apply to other datastores.

    This change moves the models from the guestagent package to the common
    package, so that the extensions package can use it in the future.
    That is: guestagent/db/models.py -> common/db/models.py

    The generic models are separated from the datastore-specific models. For
    datastores with custom models the classes have been moved to their own
    sub-package.
    Example: common/db/mysql/models.py

    Using this new approach any datastores that want custom models just need
    to create packages similar to the common/db/mysql/ package.

    The code references to these models have all been updated. Non-MySQL
    based datastores using these references have been switched to using the
    generic models.

    The tests for these models have been improved.

    Change-Id: If321202a3ec4ab0f57ee8e516b885a8307d464b7
    Partial-Bug: 1498573