Merge "CI: Use libvirt/cpu_models instead of cpu_model"

tests/templates/nova-compute-overrides.j2

 [libvirt]
 {% if ansible_architecture == 'aarch64' %}
-cpu_mode=custom
+cpu_mode = custom
 # cpu_model=max fails to boot multiple images with QEMU 7.0 and -M virt (works with "-M virt-6.2")
-cpu_model=cortex-a72
+cpu_models = cortex-a72
 {% elif ansible_architecture == 'x86_64' %}
 # RHEL 9 are being compiled for the x86_64-v2 architecture which is
 # newer than the qemu default of qemu64. Nehalem is apparently the
 # oldest model that works for x86_64-v2 and is expected to work on
 # Intel and AMD cpus with kvm or qemu.
 {% if virt_type == 'kvm' %}
-cpu_mode=custom
-cpu_model=Nehalem
+cpu_mode = custom
+cpu_models = Nehalem
 {% endif %}
 {% endif %}