[OVN][QOS] NBDB qos table entries still exist even after corresponding neutron ports are deleted

[Maciej Jozefczyk]

When removing neutron ports with qos policy applied, corresponding entries are not removed from NBDB qos table.

Steps to reproduce:

openstack network qos policy create bw-limiter
openstack network qos rule create --type bandwidth-limit --max-kbps 3000 --max-burst-kbits 2400 --egress bw-limiter
openstack network create internal_A
openstack port create vm1-port --network internal_A
openstack port set --qos-policy bw-limiter <PORT ID>
On this stage 'ovn-nbctl list qos' displays corresponding qos rule of the port
openstack port delete <PORT ID>
Result: port removed from neutron DB - this is OK. But OVN NBDB qos table still displays qos entry for this port:

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.opendev.org/740967

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: stable/ussuri
Review: https://review.opendev.org/741915

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.opendev.org/740967
Committed: https://git.openstack.org/cgit/openstack/neutron/commit/?id=ccbebfeaccf657caf8bcf8d635e3032e4c51c658
Submitter: Zuul
Branch: master

commit ccbebfeaccf657caf8bcf8d635e3032e4c51c658
Author: Maciej Józefczyk <email address hidden>
Date: Tue Jul 14 11:59:58 2020 +0000

    [OVN] Fix logic issue while deleting port with QoS

    While port has QoS policy configured the policy wasn't deleted
    because of logic issue.

    Change-Id: I3d7e70a4a110c68a89d6c575abf121cd9b97e439
    Closes-Bug: #1886962

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.opendev.org/741915
Committed: https://git.openstack.org/cgit/openstack/neutron/commit/?id=5554d620d14175b9bade595226bdc797ba498cf3
Submitter: Zuul
Branch: stable/ussuri

commit 5554d620d14175b9bade595226bdc797ba498cf3
Author: Maciej Józefczyk <email address hidden>
Date: Tue Jul 14 11:59:58 2020 +0000

    [OVN] Fix logic issue while deleting port with QoS

    While port has QoS policy configured the policy wasn't deleted
    because of logic issue.

    Change-Id: I3d7e70a4a110c68a89d6c575abf121cd9b97e439
    Closes-Bug: #1886962
    (cherry picked from commit 0e53673c5d4f49846bb439b2e1ab8e984c20d6f8)