[ovn] add ovn driver for security-group-logging

[Flavio Fernandes]

The request is about to have a log file where security groups events are logged to be
consumed by security department, like any other commercial firewall vendor has.

This is a follow up to:
https://bugs.launchpad.net/neutron/+bug/1468366

ml2/OVN has a functionality gap related to the support for security-group-logging:
https://blueprints.launchpad.net/neutron/+spec/security-group-logging

This work is also tracked under Bugzilla:
https://bugzilla.redhat.com/show_bug.cgi?id=1619266

[OpenStack Infra (hudson-openstack)]

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

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.opendev.org/c/openstack/neutron-tempest-plugin/+/791255
Committed: https://opendev.org/openstack/neutron-tempest-plugin/commit/3c0ef4e4f3a35d71a7834a026b910c6eb26b7d92
Submitter: "Zuul (22348)"
Branch: master

commit 3c0ef4e4f3a35d71a7834a026b910c6eb26b7d92
Author: Rodolfo Alonso Hernandez <email address hidden>
Date: Wed May 26 16:26:51 2021 +0000

    Switch neutron-tempest-plugin-api job to be ML2/OVN

    This patch reverts [1] and switches back to the default networking
    backend installed by devstack.

    This patch also changes the GRE type networks with VLAN type networks
    because of the lack of support.

    OVN version is set to v21.03.0. OVN v20.12.0 [2] introduced the support
    for ACL log meters (Neutron logging service), but this version is too
    old right now.

    Partial-Bug: #1928345
    Related-Bug: #1929658
    Related-Bug: #1914757

    [1]https://review.opendev.org/c/openstack/neutron-tempest-plugin/+/791417
    [2]https://github.com/ovn-org/ovn/commit/880dca99eaf73db7e783999c29386d03c82093bf

    Change-Id: Id087c2a30a7279f9ef9a2c34ddc68a0b11d20c4b