move nova-ovs-hybrid-plug to deploy with spice and fix qxl default

In centos/rhel 9 qemu supprot for the qxl model was removed
with the removal of spice support.
In ubuntu 24.04 qemu support for qxl and spice supprot
has now also been removed.
debian 12 bookworm still support spice in there qemu package.

When we updated the default video model to virtio for x86 we
left a config driven special case for spice to default to qxl
since that nolonger works on centos or ubuntu based distos that
default is not helpful so this change removes the special case
making virtio the default for x86 regardless of the console used.

This change also updates the nova-ovs-hybrid-plug to test with spice
so that we have at least one job using it. to enable that the job is
moved to debian.

Closes-Bug: #2097529
Change-Id: I265ad2ced3729bed41bf53c58dcebadb775ce1f7

.zuul.yaml

@@ -143,6 +143,7 @@
 - job:
     name: nova-ovs-hybrid-plug
     parent: tempest-multinode-full-py3
+    nodeset: devstack-two-node-debian-bookworm
     description: |
       Run move operations, reboot, and evacuation (via the same post-run hook
       as the nova-live-migration job) tests with the OVS network backend and
@@ -175,6 +176,7 @@
         Q_ML2_TENANT_NETWORK_TYPE: vxlan
         Q_ML2_PLUGIN_MECHANISM_DRIVERS: openvswitch
         ML2_L3_PLUGIN: router
+        NOVA_VNC_ENABLED: False
       devstack_services:
         # Disable OVN services
         br-ex-tcpdump: false
@@ -202,6 +204,9 @@
         s-object: false
         s-proxy: false
         openstack-cli-server: true
+        # disable vnc and enable spice
+        n-novnc: false
+        n-spice: true
       devstack_local_conf:
         post-config:
           "/$NEUTRON_CORE_PLUGIN_CONF":
@@ -220,6 +225,8 @@
           Q_ML2_TENANT_NETWORK_TYPE: vxlan
           Q_ML2_PLUGIN_MECHANISM_DRIVERS: openvswitch
           ML2_L3_PLUGIN: router
+          NOVA_VNC_ENABLED: False
+          NOVA_SPICE_ENABLED: true
         devstack_services:
           # Disable OVN services
           br-ex-tcpdump: false