Voltha stacks on same node

Change-Id: Ide97ca9ed76c206e51d424dcb427854e119efa24
diff --git a/voltha/values.yaml b/voltha/values.yaml
index 2bc6ea6..b25670b 100644
--- a/voltha/values.yaml
+++ b/voltha/values.yaml
@@ -141,3 +141,8 @@
     limits:
       cpu: ~
       memory: ~
+
+# Define scheduling rules for stack pods
+scheduleRules:
+  preferStackPodsOnSameNode: false
+  preferStacksOnDifferentNodes: false