Adjust reclass definitions for k8s calico refactoring.

Change-Id: I2e651cd14ebe8a82e8ef96eb38d27d97a3fcb814
diff --git a/kubernetes/master/cluster.yml b/kubernetes/master/cluster.yml
index f21f003..5db89c6 100644
--- a/kubernetes/master/cluster.yml
+++ b/kubernetes/master/cluster.yml
@@ -12,6 +12,6 @@
       container: false
       network:
         engine: calico
-        private_ip_range: ${_param:calico_private_network}/${_param:calico_private_netmask}
-        prometheus:
-          enabled: true
+        calico:
+          prometheus:
+            enabled: true