Make POD's node selector can configure in values.yaml

Change-Id: Ia6b4588546fda60ea2cd9ec581a017826cac9f66
diff --git a/mcord/mcord-control-plane/values.yaml b/mcord/mcord-control-plane/values.yaml
index 930cfcd..e226c0f 100644
--- a/mcord/mcord-control-plane/values.yaml
+++ b/mcord/mcord-control-plane/values.yaml
@@ -34,6 +34,12 @@
 accelleran_hostname: "10.90.0.132"
 accelleran_port: 31412
 
+hssdb_node_selector: node3
+hss_node_selector: node3
+mme_node_selector: node2
+spgwc_node_selector: node2
+
+
 hss:
   # TODO: init UE's IMEI to DB?
   images: