Set cpu_mode to none for os-ha-ovs

In devcloud compute nodes have different CPUs, as result
nova migration will not work, when underlay VMs were spawned
on compute with different CPUs.

This patch change cpu_mode to none.

Change-Id: I951f631e5254196c50fa9bcfa966c5999368b982
Related-Prod: PROD-16579
diff --git a/classes/cluster/os-ha-ovs/openstack/compute.yml b/classes/cluster/os-ha-ovs/openstack/compute.yml
index 96db48a..8932786 100644
--- a/classes/cluster/os-ha-ovs/openstack/compute.yml
+++ b/classes/cluster/os-ha-ovs/openstack/compute.yml
@@ -15,6 +15,7 @@
     linux_system_codename: xenial
   nova:
     compute:
+      cpu_mode: none
       vncproxy_url: http://${_param:cluster_vip_address}:6080
       notification:
         driver: messagingv2