Comment 2 for bug 1838473

Reviewed: https://review.opendev.org/673692
Committed: https://git.openstack.org/cgit/openstack/neutron-lib/commit/?id=24aef1398b5b69967696aa8cb6598ab1be37c626
Submitter: Zuul
Branch: master

commit 24aef1398b5b69967696aa8cb6598ab1be37c626
Author: Nate Johnston <email address hidden>
Date: Tue Jul 30 17:15:24 2019 -0400

    Ensure that extended ethertypes still work by name

    When the change to add support for extended ethertypes was introduced,
    one scenario for backwards compatibility was not addressed in the
    validator: using the canonical string names for ethertypes. This was
    previously supported in the original implementation, using 'IPv4' or
    'IPv6' for example.

    Since the list of canonical ethertype names is available from os-ken we
    consume it from there, which adds an additional dependency for
    neutron-lib.

    Related-Bug: #1838473
    Change-Id: I53c6538dfbeea9691d95c6c555f0c56ae13d1a33