Remove unneeded compatibility conversions

[Rodolfo Alonso]

In order to remove complexity and cleanup the code, those compatibility conversions present for more than two releases can be removed now.

[OpenStack Infra (hudson-openstack)]

Related fix proposed to branch: master
Review: https://review.opendev.org/658155

[OpenStack Infra (hudson-openstack)]

Related fix proposed to branch: master
Review: https://review.opendev.org/660654

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.opendev.org/660654
Committed: https://git.openstack.org/cgit/openstack/neutron/commit/?id=079de324ab21bea96875c3d71eda268ec72430fa
Submitter: Zuul
Branch: master

commit 079de324ab21bea96875c3d71eda268ec72430fa
Author: Rodolfo Alonso Hernandez <email address hidden>
Date: Wed May 22 10:31:20 2019 +0000

    Add documentation about OVO "obj_make_compatible"

    Adds new documentation about how to implement
    "VersionedObject.obj_make_compatible" when a new object version
    is released and how to test it.

    Change-Id: I055cf2ae493759562175f9d859d2a065458ca7e2
    Related-Bug: #1828437

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.opendev.org/658155
Committed: https://git.openstack.org/cgit/openstack/neutron/commit/?id=db3001a7a2fe038704f1f74667f0019f833ba867
Submitter: Zuul
Branch: master

commit db3001a7a2fe038704f1f74667f0019f833ba867
Author: Rodolfo Alonso Hernandez <email address hidden>
Date: Thu May 9 16:10:14 2019 +0000

    Remove QoS related objects unneeded compatibility conversions

    Last changes affecting to object compatibility, done in those OVOs:
    * QoSPolicy: https://review.opendev.org/#/c/428304/, 2y 4m ago.
    * QosBandwidthLimitRule: https://review.opendev.org/#/c/449831/,
      2y 5m ago
    * QosDscpMarkingRule: https://review.opendev.org/#/c/300501/,
      3y 3m ago
    * QosMinimumBandwidthRule: https://review.opendev.org/#/c/344145/,
      3y ago
    * QosRuleType: https://review.opendev.org/#/c/475260/, 2y 3m ago

    Change-Id: I5fd394c2deb4446e21e092ea490791cc5bbc5669
    Related-Bug: #1828437

[OpenStack Infra (hudson-openstack)]

Related fix proposed to branch: master
Review: https://review.opendev.org/733112

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.opendev.org/733112
Committed: https://git.openstack.org/cgit/openstack/neutron/commit/?id=dc655cabcb9c21637029f864887901a3d85ce0f1
Submitter: Zuul
Branch: master

commit dc655cabcb9c21637029f864887901a3d85ce0f1
Author: Rodolfo Alonso Hernandez <email address hidden>
Date: Wed Jun 3 11:17:03 2020 +0000

    Remove OVO unneeded compatibility conversions

    OVOs and commit introducing the removed conversion:
    - PortDNS:
      * https://review.opendev.org/#/c/457035/: included in Pike
    - Port:
      * https://review.opendev.org/#/c/465423/: included in Pike
    - Trunk:
      * https://review.opendev.org/#/c/382659/: included in Ocata
    - QosRuleType:
      * https://review.opendev.org/#/c/475260/: included in Pike

    Change-Id: I9353fa1b660212f244abf74921ebc90f0a2333b7
    Related-Bug: #1828437