Description of problem:
During an FFU form 13 to 16 the compute nodes are upgraded to the hybrid state
where the 16 version of all container bar nova_libvirt are intended to be deployed on the rhel 7 host.
This is done to allow move operations(live migration) to be performed on the vms on that host prior to the leapp upgrade form rhel 7 to rhel8
During the FFU the nuetorn agent on the compute node are not also moved to the osp 16 version.
as a result it is unsafe to execute move operations as we cannot role back any failures.
Version-Release number of selected component (if applicable):
100%? this was observed in a customer session but shoudl affect all upgrades?
Steps to Reproduce:
1. deploy osp 13 with ml2/ovs
2. Follow FFU procedure to hybrid state
3. check version of neutron containers on a hybrid state compute node.
osp 13 version of neutron containers are present.
osp 16 version of neutron containers are deployed.
The OSP 13 version of the neutron l2 agent do not support multiple port binding
which means if an error occurse with a live migration we cannot role back.
in general it is also unsafe to mix osp 13 agents with osp 16 contolplane services as this combination is untested and unsupported.