Add cpu_mode in nova.conf

With libvirt 2.0, when using qemu cpu mode is not properly
evaluated and need to be set to cpu_mode = none.

Add this option when kvm is not supported, otherwise user
will still facing errors when launching instances over qemu.

Change-Id: Ib00fa257fb33fd3281f484a47a945640da8dda56

tools/deployment/developer/ceph/160-compute-kit.sh

@@ -32,6 +32,7 @@ else
   helm upgrade --install nova ./nova \
       --namespace=openstack \
       --set conf.nova.libvirt.virt_type=qemu \
+      --set conf.nova.libvirt.cpu_mode=none \
       ${OSH_EXTRA_HELM_ARGS} \
       ${OSH_EXTRA_HELM_ARGS_NOVA}
 fi

tools/deployment/developer/nfs/160-compute-kit.sh

@@ -34,6 +34,7 @@ else
       --namespace=openstack \
       --set conf.ceph.enabled=false \
       --set conf.nova.libvirt.virt_type=qemu \
+      --set conf.nova.libvirt.cpu_mode=none \
       ${OSH_EXTRA_HELM_ARGS} \
       ${OSH_EXTRA_HELM_ARGS_NOVA}
 fi