Set default nodePort for Voltha services

Sometimes randomly assigned port number conflicts with the port numbers that
is resereved by other apps.

Change-Id: I6838ee3aee80d1cc83980d225c702c5f3c6d12f5
diff --git a/voltha/values.yaml b/voltha/values.yaml
index 3aa83fd..33d98d5 100644
--- a/voltha/values.yaml
+++ b/voltha/values.yaml
@@ -36,6 +36,7 @@
         - name: mystery
           port: 8001
           targetPort: 8001
+          nodePort: 30126
         - name: mystery2
           port: 8443
           targetPort: 8443
@@ -43,6 +44,7 @@
         - name: grpc
           port: 50555
           targetPort: 50555
+          nodePort: 30127
 
 etcd:
   cluster: