Adding a dashboard for VOLTHA-2.x, disabled by default

Change-Id: Iaa41974a62cdeb112961aa048d2a93d19c82ed61
diff --git a/nem-monitoring/values.yaml b/nem-monitoring/values.yaml
index 41b5ec3..d7236e8 100644
--- a/nem-monitoring/values.yaml
+++ b/nem-monitoring/values.yaml
@@ -98,6 +98,7 @@
   onos: true
   aaa: true
   voltha: true
+  voltha2: false
   omec: false
   aetherClusters: false
   aetherEdges: false