Refactor app.go and wire in autoregistration.

Signed-off-by: Matt Moyer <moyerm@vmware.com>

deploy/deployment.yaml

@@ -49,8 +49,8 @@ spec:
           imagePullPolicy: IfNotPresent
           command:
           - ./app
-          - --config
-          - /etc/config/placeholder-config.yaml
+          - --config=/etc/config/placeholder-config.yaml
+          - --downward-api-path=/etc/podinfo
           volumeMounts:
           - name: config-volume
             mountPath: /etc/config
@@ -58,3 +58,15 @@ spec:
       - name: config-volume
         configMap:
           name: #@ data.values.app_name + "-config"
+        - name: podinfo
+          mountPath: /etc/podinfo
+  volumes:
+    - name: podinfo
+      downwardAPI:
+        items:
+          - path: "labels"
+            fieldRef:
+              fieldPath: metadata.labels
+          - path: "namespace"
+            fieldRef:
+              fieldPath: metadata.namespace