Add new configuration of StackLight on virtual-mcp-newton-ovs model

Change-Id: I7ab5d0989d6a4031095f54fdf4fe25bf87fb9caa
diff --git a/classes/cluster/virtual-mcp-mitaka-ovs/openstack/compute.yml b/classes/cluster/virtual-mcp-mitaka-ovs/openstack/compute.yml
index e8c5eae..cbe05b2 100644
--- a/classes/cluster/virtual-mcp-mitaka-ovs/openstack/compute.yml
+++ b/classes/cluster/virtual-mcp-mitaka-ovs/openstack/compute.yml
@@ -6,6 +6,7 @@
 - system.nova.compute.cluster
 - system.neutron.compute.cluster
 - system.heka.alarm.openstack_compute
+- system.prometheus.exporters.libvirt
 - cluster.virtual-mcp-mitaka-ovs
 parameters:
   _param: