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

Change-Id: Ia6b4588546fda60ea2cd9ec581a017826cac9f66
diff --git a/mcord/mcord-control-plane/templates/cassandra.yaml b/mcord/mcord-control-plane/templates/cassandra.yaml
index 312233b..cdb827c 100644
--- a/mcord/mcord-control-plane/templates/cassandra.yaml
+++ b/mcord/mcord-control-plane/templates/cassandra.yaml
@@ -46,7 +46,7 @@
         app: cassandra
     spec:    
       nodeSelector:
-       kubernetes.io/hostname: "node3"
+       kubernetes.io/hostname: "{{ .Values.hssdb_node_selector }}"
       terminationGracePeriodSeconds: 1
       containers:
       - name: cassandra
diff --git a/mcord/mcord-control-plane/templates/cp.yaml b/mcord/mcord-control-plane/templates/cp.yaml
index 2197347..37ae75f 100644
--- a/mcord/mcord-control-plane/templates/cp.yaml
+++ b/mcord/mcord-control-plane/templates/cp.yaml
@@ -63,7 +63,7 @@
         app: ngic-cp
     spec:
       nodeSelector:
-        kubernetes.io/hostname: "node2"
+        kubernetes.io/hostname: "{{ .Values.spgwc_node_selector }}"
       initContainers:
       - name: init-iptables
         image: {{ .Values.ngic_cp.images.init }}
diff --git a/mcord/mcord-control-plane/templates/hss.yaml b/mcord/mcord-control-plane/templates/hss.yaml
index d6d2f7e..9dd3918 100644
--- a/mcord/mcord-control-plane/templates/hss.yaml
+++ b/mcord/mcord-control-plane/templates/hss.yaml
@@ -46,7 +46,7 @@
         app: hss
     spec:
       nodeSelector:
-        kubernetes.io/hostname: "node3"
+        kubernetes.io/hostname: "{{ .Values.hss_node_selector }}"
       terminationGracePeriodSeconds: 1
       initContainers:
       - name: init-db
diff --git a/mcord/mcord-control-plane/templates/mme.yaml b/mcord/mcord-control-plane/templates/mme.yaml
index 89e7309..9685c82 100644
--- a/mcord/mcord-control-plane/templates/mme.yaml
+++ b/mcord/mcord-control-plane/templates/mme.yaml
@@ -60,7 +60,7 @@
         app: mme
     spec:
       nodeSelector:
-        kubernetes.io/hostname: "node2"
+        kubernetes.io/hostname: "{{ .Values.mme_node_selector }}"
       terminationGracePeriodSeconds: 1
       initContainers:
       - name: init-mme