Comment 5 for bug 1834306

Reviewed: https://review.opendev.org/668696
Committed: https://git.openstack.org/cgit/openstack/python-tripleoclient/commit/?id=a7dd7a6bbe94388fe73bdfedf47984e734183106
Submitter: Zuul
Branch: master

commit a7dd7a6bbe94388fe73bdfedf47984e734183106
Author: Harald Jensås <email address hidden>
Date: Tue Jul 2 17:24:05 2019 +0200

    Validate all or no subnets use dns_nameservers

    Follow up for https://review.opendev.org/667380

    Adds a validation to ensure that dns_nameservers
    are used for all subnets if used. If not subnets
    defines dns_nameservers they all fall back to
    use undercloud_nameservers which was has been the
    default for some time.

    Relates-Bug: #1834306
    Change-Id: I1cc1d20f8e15d531fb94b02c8d1313888fc8964d