make device management service visible outside the cluster via nodePort / expose grpc port / fix typos / update version

Change-Id: I19d37ae55f7b904b9843e15026b2d943bc0beebe
diff --git a/nem-monitoring/values.yaml b/nem-monitoring/values.yaml
index 8c93263..2e90f6e 100644
--- a/nem-monitoring/values.yaml
+++ b/nem-monitoring/values.yaml
@@ -29,8 +29,9 @@
 
 nem_voltha_kpi_exporter_nodePort: 31080
 nem_voltha_kpi_exporter_replicas: 2
-device_management_replicas: 1
-
+nem_device_management_grpcPort: 31085
+nem_device_management_httpPort: 30180
+nem_device_management_replicas: 1
 args:
   voltha_kpi_broker: cord-kafka:9092