Comment 21 for bug 1801919

Reviewed: https://review.openstack.org/617354
Committed: https://git.openstack.org/cgit/openstack-dev/devstack/commit/?id=56946cfc5f88d8df3b4b9a1a2530ce2cc9a68cde
Submitter: Zuul
Branch: master

commit 56946cfc5f88d8df3b4b9a1a2530ce2cc9a68cde
Author: Nate Johnston <email address hidden>
Date: Mon Nov 12 11:17:07 2018 -0500

    Replace deprecated brctl with ip commands

    The bridge-utils package has been deprecated for some time now [1] and
    'brctl' does not exist on some more recent distros like Fedora 28.
    Replace references to brctl with the proper ip commands.

    Calls to "brctl show" are not being replaced with calls to "bridge link"
    because the output format is very different and in testing some bridges
    were not listed. So the simpler method of consulting /sys/class/net is
    used.

    In worlddump.py we try running both because failures are handled
    gracefully by _dump_cmd(), as well as "ip link show type bridge" for
    additional info.

    [1] https://lwn.net/Articles/703776/ for example

    Change-Id: Ie4c8ad6ce4a09c38023c9e4ec7834c249403145f
    Partial-Bug: #1801919