Update nested-virt testing for the 2023.1 cycle

Since the new main platform for testing is now Ubuntu Jammy, switch the
nested-virt jobs as well. In order to be able to keep the previous setup
for stable/zed and older branches, we add explicit nodeset overrides for
the affected jobs.

Cirros 0.5.1 seems to have issues booting on Jammy hosts, update to the
latest stable release 0.5.2.

Depends-on: https://review.opendev.org/c/openstack/devstack/+/860795
Change-Id: Ie835afa301e7fd17fb751b932adac74141e0e9a4
diff --git a/zuul.d/xena_jobs.yaml b/zuul.d/xena_jobs.yaml
index e0a58a7..a5b3d14 100644
--- a/zuul.d/xena_jobs.yaml
+++ b/zuul.d/xena_jobs.yaml
@@ -95,6 +95,7 @@
     name: neutron-tempest-plugin-scenario-openvswitch-xena
     parent: neutron-tempest-plugin-openvswitch
     override-checkout: stable/xena
+    nodeset: neutron-nested-virt-ubuntu-focal
     vars:
       branch_override: stable/xena
       tempest_test_regex: "\
@@ -115,6 +116,7 @@
     name: neutron-tempest-plugin-scenario-openvswitch-iptables_hybrid-xena
     parent: neutron-tempest-plugin-openvswitch-iptables_hybrid
     override-checkout: stable/xena
+    nodeset: neutron-nested-virt-ubuntu-focal
     vars:
       branch_override: stable/xena
       tempest_test_regex: "\
@@ -135,6 +137,7 @@
     name: neutron-tempest-plugin-scenario-linuxbridge-xena
     parent: neutron-tempest-plugin-linuxbridge
     override-checkout: stable/xena
+    nodeset: neutron-nested-virt-ubuntu-focal
     vars:
       branch_override: stable/xena
       tempest_test_regex: "\
@@ -155,6 +158,7 @@
     name: neutron-tempest-plugin-scenario-ovn-xena
     parent: neutron-tempest-plugin-ovn
     override-checkout: stable/xena
+    nodeset: neutron-nested-virt-ubuntu-focal
     vars:
       branch_override: stable/xena
       tempest_test_regex: "\
@@ -182,6 +186,7 @@
     name: neutron-tempest-plugin-designate-scenario-xena
     parent: neutron-tempest-plugin-designate-scenario
     override-checkout: stable/xena
+    nodeset: neutron-nested-virt-ubuntu-focal
     vars:
       branch_override: stable/xena
       network_api_extensions_common: *api_extensions