OVN scenario jobs are failing on Ubuntu Focal due to ebtables-nft used by default

[Slawek Kaplonski]

There is error like "ebtables v1.8.4 (nf_tables): table `broute' is incompatible, use 'nft' tool." in those jobs. See e.g. https://zuul.opendev.org/t/openstack/build/fcac3ba1bd4c49598ab249b5e68680af or https://zuul.opendev.org/t/openstack/build/047d24a5de014e12987297c6d7a89df1
I think we need to switch to ebtables-legacy for now.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.opendev.org/755809

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.opendev.org/755809
Committed: https://git.openstack.org/cgit/openstack/neutron/commit/?id=a8ceb09f98e3386d9c84ce8fcb862042aea190bb
Submitter: Zuul
Branch: master

commit a8ceb09f98e3386d9c84ce8fcb862042aea190bb
Author: Slawek Kaplonski <email address hidden>
Date: Fri Oct 2 16:35:04 2020 +0200

    Use ebtables-legacy also in ovn multinode jobs

    For other jobs which inherits from neutron-tempest-base it
    was changed some time ago.
    But ovn multinode jobs don't inherits from that base job
    so this patch fixes it for those jobs as well by adding same
    configure_ebtables.yaml playbook to pre-run in the
    neutron-ovn-multinode-base job.

    Change-Id: Icb4fd80133ee10ad6c40e160013b4ab91d2c5a6b
    Closes-Bug: #1898211

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: stable/victoria
Review: https://review.opendev.org/756260

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.opendev.org/756260
Committed: https://git.openstack.org/cgit/openstack/neutron/commit/?id=2458509c17f939bcd52f9a3319ce45240e866099
Submitter: Zuul
Branch: stable/victoria

commit 2458509c17f939bcd52f9a3319ce45240e866099
Author: Slawek Kaplonski <email address hidden>
Date: Fri Oct 2 16:35:04 2020 +0200

    Use ebtables-legacy also in ovn multinode jobs

    For other jobs which inherits from neutron-tempest-base it
    was changed some time ago.
    But ovn multinode jobs don't inherits from that base job
    so this patch fixes it for those jobs as well by adding same
    configure_ebtables.yaml playbook to pre-run in the
    neutron-ovn-multinode-base job.

    Change-Id: Icb4fd80133ee10ad6c40e160013b4ab91d2c5a6b
    Closes-Bug: #1898211
    (cherry picked from commit a8ceb09f98e3386d9c84ce8fcb862042aea190bb)

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/neutron 17.1.0 release.

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/neutron 18.0.0.0rc1 release candidate.