[RFE] Support OVN driver for Octavia

[Numan Siddique]

Octavia supports provider drivers. We can make use of native OVN loadbalancing by adding an OVN provider driver.

[Numan Siddique (numansiddique)]

https://review.openstack.org/#/c/577395/

[Lucas Alvares Gomes (lucasagomes)]

Marking it as in progress because it still lacks tests and documentation.

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/608252
Committed: https://git.openstack.org/cgit/openstack/networking-ovn/commit/?id=032872d93bfbac451f2b983e242f03a77d16d5c9
Submitter: Zuul
Branch: master

commit 032872d93bfbac451f2b983e242f03a77d16d5c9
Author: Reedip <email address hidden>
Date: Fri Oct 5 10:47:01 2018 +0000

    Add support for UDP protocols in Octavia OVN Driver

    This patch adds support for UDP protocol. It however also introduces
    a limitation. Currently OVN flows are configured such that LBs can
    support only a single protocol. Therefore, an LB can be configured
    to use only UDP or only TCP.
    The protocol in the LB is set by the FIRST Listener associated with
    it.
    This patch allows pools to also have UDP protocol.
    Partial-Bug: #1789157
    Change-Id: I1fa13dfbd165f470bfc0b83222bdec36edf70f94

[OpenStack Infra (hudson-openstack)]

Change abandoned by Lucas Alvares Gomes (<email address hidden>) on branch: master
Review: https://review.openstack.org/608203

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: stable/train
Review: https://review.opendev.org/701932

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.opendev.org/701932
Committed: https://git.openstack.org/cgit/openstack/networking-ovn/commit/?id=c6e5339d3d392342d643d777263064f4a7f7a9aa
Submitter: Zuul
Branch: stable/train

commit c6e5339d3d392342d643d777263064f4a7f7a9aa
Author: Maciej Józefczyk <email address hidden>
Date: Tue Dec 17 12:37:48 2019 +0000

    Add support for multiple L4 protocols withing same LB

    This change introduces a way of providing multiple listeners and pools
    on the same Load Balancer, but with different L4 protocols.

    In case there are more than one unique protocol defined in Octavia pools
    or Octavia listeners the OVN driver now adds another Load_Balancer row
    per protocol, but with the same name. The selection of which OVN
    Load_Balancer should be used is done by a protocol key.

    This change also adds possibility to expose two listeners on the same
    port, but with different L4 protocol. The common use-case is providing
    a DNS service that listens both on UDP and TCP sockets.

    Partial-Bug: #1789157
    Change-Id: I2ee13b75713e7538d1b4f70207a90a95315eb914

[OpenStack Infra (hudson-openstack)]

Change abandoned by Maciej Józefczyk (<email address hidden>) on branch: master
Review: https://review.opendev.org/671293
Reason: It will go to dedicated repository.