Tweak node selector to be consistent with other CDN charts

Change-Id: I207f2e125c141878ce54e58c11f8d38450492678
diff --git a/mcord/mcord-cdn-local-free/templates/nginx.yaml b/mcord/mcord-cdn-local-free/templates/nginx.yaml
index ac3d2d9..49abe46 100644
--- a/mcord/mcord-cdn-local-free/templates/nginx.yaml
+++ b/mcord/mcord-cdn-local-free/templates/nginx.yaml
@@ -54,7 +54,7 @@
     spec:
       #hostNetwork: true
       nodeSelector:
-        kubernetes.io/hostname: {{ .Values.node_selector }}
+        kubernetes.io/hostname: {{ .Values.cdn_node_selector }}
       terminationGracePeriodSeconds: 0
       imagePullSecrets:
       - name: nexus-docker-secret