Voltha stacks on same node

Change-Id: Ide97ca9ed76c206e51d424dcb427854e119efa24
diff --git a/voltha-adapter-openolt/values.yaml b/voltha-adapter-openolt/values.yaml
index 431bbfd..b5224b5 100644
--- a/voltha-adapter-openolt/values.yaml
+++ b/voltha-adapter-openolt/values.yaml
@@ -106,3 +106,8 @@
   limits:
     cpu: ~
     memory: ~
+
+# Define scheduling rules for stack pods
+scheduleRules:
+  preferStackPodsOnSameNode: false
+  preferStacksOnDifferentNodes: false