Description of problem:

After running the rally scenario (which ran successfully), some stale "neutron-metadata-agent-ovn" containers exist on compute nodes (though all neutron resources are deleted successfully by rally).

Note: This rally scenario boots 1000 VMs and and pings their floating ip. 

Environment detials:
OSP version: OSP16
Puddle: RHOS_TRUNK-16.0-RHEL-8-20200226.n.1
Number of controller nodes: 3
Number of compute nodes: 3
Non DVR setup 

()[root@compute-0 /]$ ovn-nbctl --version
ovn-nbctl (Open vSwitch) 2.11.1
DB Schema 5.18.0
()[root@compute-0 /]$ ovn-sbctl --version
ovn-sbctl (Open vSwitch) 2.11.1
DB Schema 2.6.0
()[root@compute-0 /]$ ovs-vsctl --version
ovs-vsctl (Open vSwitch) 2.11.0
DB Schema 7.16.1

DB Schema 7.16.1
()[root@compute-0 /]$ ovn-controller --version
ovn-controller (Open vSwitch) 2.11.1
OpenFlow versions 0x4:0x4


(overcloud) [stack@undercloud ~]$ neutron net-list
neutron CLI is deprecated and will be removed in the future. Use openstack CLI instead.
+--------------------------------------+--------+----------------------------------+----------------------------------------------------+
| id                                   | name   | tenant_id                        | subnets                                            |
+--------------------------------------+--------+----------------------------------+----------------------------------------------------+
| f3fca4c5-0294-447d-968e-b8fefbd36167 | public | 9fe5a688c4be46a39e1a723312d8bb77 | 316a895f-87c5-482d-b7ba-12d55202d7e9 172.18.0.0/16 |
+--------------------------------------+--------+----------------------------------+----------------------------------------------------+
(overcloud) [stack@undercloud ~]$ neutron router-list
neutron CLI is deprecated and will be removed in the future. Use openstack CLI instead.

(overcloud) [stack@undercloud ~]$ 


[root@compute-0 ~]# sudo docker ps | grep neutron-haproxy-ovnmeta | wc -l
Emulate Docker CLI using podman. Create /etc/containers/nodocker to quiet msg.
570


[root@compute-0 ~]# sudo docker ps | grep neutron-haproxy-ovnmeta
4e89fe103fbd  undercloud.ctlplane.localdomain:8787/rh-osbs/rhosp16-openstack-neutron-metadata-agent-ovn:20200226.1  /bin/bash -c HAPR...  12 days ago  Up 12 days ago         neutron-haproxy-ovnmeta-dce147c6-686b-4f23-8222-91516ddce77f
d45a8e512825  undercloud.ctlplane.localdomain:8787/rh-osbs/rhosp16-openstack-neutron-metadata-agent-ovn:20200226.1  /bin/bash -c HAPR...  12 days ago  Up 12 days ago         neutron-haproxy-ovnmeta-72c6967d-60e3-434d-b1cb-68bdf64b356d
7fe55fc0c81a  undercloud.ctlplane.localdomain:8787/rh-osbs/rhosp16-openstack-neutron-metadata-agent-ovn:20200226.1  /bin/bash -c HAPR...  12 days ago  Up 12 days ago         neutron-haproxy-ovnmeta-136f2f4b-739a-4474-be17-66d405c37c7d
80ad37634b62  undercloud.ctlplane.localdomain:8787/rh-osbs/rhosp16-openstack-neutron-metadata-agent-ovn:20200226.1  /bin/bash -c HAPR...  12 days ago  Up 12 days ago         neutron-haproxy-ovnmeta-8a7ea52f-ad33-4abb-9125-66ebaf4bd55a
55265c27cf86  undercloud.ctlplane.localdomain:8787/rh-osbs/rhosp16-openstack-neutron-metadata-agent-ovn:20200226.1  /bin/bash -c HAPR...  12 days ago  Up 12 days ago         neutron-haproxy-ovnmeta-72d8f067-b067-4986-a32f-c249895832af
17c2c9dccd26  undercloud.ctlplane.localdomain:8787/rh-osbs/rhosp16-openstack-neutron-metadata-agent-ovn:20200226.1  /bin/bash -c HAPR...  12 days ago  Up 12 days ago         neutron-haproxy-ovnmeta-524e97e8-4bef-44e3-8db2-219fbd0cf8ca
98cc91370aae  undercloud.ctlplane.localdomain:8787/rh-osbs/rhosp16-openstack-neutron-metadata-agent-ovn:20200226.1  /bin/bash -c HAPR...  13 days ago  Up 13 days ago        

How reproducible:


Steps to Reproduce:
1.
2.
3.

Actual results:


Expected results:


Additional info: