Add overrides parameters for k8s templates.

* Added docker-engine as overrided parameter.
* Added netchecker and helm parameter as a overrided
parameters.

Change-Id: I05de62bd31efe1400533a4ce9f82a59ba13c08fc
diff --git a/classes/cluster/virtual-mcp11-k8s-contrail/kubernetes/control.yml b/classes/cluster/virtual-mcp11-k8s-contrail/kubernetes/control.yml
index 0116857..c4dcad2 100644
--- a/classes/cluster/virtual-mcp11-k8s-contrail/kubernetes/control.yml
+++ b/classes/cluster/virtual-mcp11-k8s-contrail/kubernetes/control.yml
@@ -32,13 +32,16 @@
       namespace:
         netchecker:
           enabled: true
-      addons:
+      namespace:
         netchecker:
-          enabled: true
+          enabled: ${_param:kubernetes_netchecker_enabled}
+      addons:
+        helm:
+          enabled: ${_param:kubernetes_helm_enabled}
+        netchecker:
+          enabled: ${_param:kubernetes_netchecker_enabled}
           agent_image: ${_param:kubernetes_netchecker_agent_image}
           server_image: ${_param:kubernetes_netchecker_server_image}
-        helm:
-          enabled: true
       network:
         engine: opencontrail
         public_ip_range: 185.22.97.128/26