Comment 18 for bug 1840895

Reviewed: https://review.opendev.org/682558
Committed: https://git.openstack.org/cgit/openstack/neutron/commit/?id=f050abab45daeb91443797b6c82a31eb06885a68
Submitter: Zuul
Branch: stable/rocky

commit f050abab45daeb91443797b6c82a31eb06885a68
Author: Slawek Kaplonski <email address hidden>
Date: Fri Aug 30 22:32:19 2019 +0200

    Fix creation of vlan network with segmentation_id set to 0

    In case when vlan network was created with segmentation_id=0 and without
    physical_network given, it was passing validation of provider segment
    and first available segmentation_id was choosen for network.
    Problem was that in such case all available segmentation ids where
    allocated and no other vlan network could be created later.

    This patch fixes validation of segmentation_id when it is set to value 0.

    Change-Id: Ic768deb84d544db832367f9a4b84a92729eee620
    Closes-bug: #1840895
    (cherry picked from commit f01f3ae5dd0dd7dd9aa513a1b50e04e20a08b97b)