Now this job runs on 3 nodes:
* 1 main, controller and networker like, without nova-compute service on
it, this node has "dvr_snat" set as L3 agent's mode,
* 2 compute like nodes with nova compute and L3 agent in "dvr" mode
Even though there is only one "dvr_snat" node in the job, it keeps
"l3_ha" option set to "true" in Neutron's config. That way we are still
testing "ha" code path of the centralized part of the router but also
job is now closer to the real life, and supported deployments topology.
Additionally this patch adds nodeset for 3 nodes with Ubuntu Jammy and
controller node not running compute service as there is no such nodeset
defined globally.
Related-Bug: #1934666
Change-Id: Id6a91795ebc73be26bb34d9eaf8a53b2b6a1ba0c