fix cluster public host param for contrail

Change-Id: I41efba506932ef58ed25406cb531fb63c4faa3e2
diff --git a/classes/cluster/virtual-mcp10-contrail/openstack/init.yml b/classes/cluster/virtual-mcp10-contrail/openstack/init.yml
index 81ac134..c234ecb 100755
--- a/classes/cluster/virtual-mcp10-contrail/openstack/init.yml
+++ b/classes/cluster/virtual-mcp10-contrail/openstack/init.yml
@@ -4,7 +4,7 @@
     apt_mk_version: nightly
     openstack_region: RegionOne
     admin_email: root@localhost
-    cluster_public_host: _
+    cluster_public_host: 172.16.10.254
     opencontrail_version: 3.0
     opencontrail_compute_dns: 8.8.8.8
     opencontrail_stats_password: contrail123