Comment 1 for bug 1522637

Reviewed: https://review.openstack.org/253130
Committed: https://git.openstack.org/cgit/openstack/oslo.config/commit/?id=5490a28a1398f10a3d346fef23374a972f90c40f
Submitter: Jenkins
Branch: master

commit 5490a28a1398f10a3d346fef23374a972f90c40f
Author: Davanum Srinivas <email address hidden>
Date: Thu Dec 3 13:41:38 2015 -0500

    [fix-compat] Support older use case for Opt type

    In I7cf94a1b2cbbfe67282e8a157548caff825d2811, we we moved
    type formatting from generator to type, however we still have
    some older code/libraries that were using a Opt with a type
    set to a string. We need to support them until we find and
    fix all use cases. So we explicitly check if format_defaults
    is present and call it if it is. If format_defaults is
    not present we call the older code from the change id
    mentioned above.

    Closes-Bug: #1522637
    Change-Id: I298e75afbd43bd35aba93c38129008789ed39146