Merge pull request #37100 from apatil/master

Automatic merge from submit-queue

Adding NAMESPACE to elasticsearch pod environment from downward API

**What this PR does / why we need it**:

The elasticsearch cluster addon references the `NAMESPACE` environmental variable here: https://github.com/kubernetes/kubernetes/blob/master/cluster/addons/fluentd-elasticsearch/es-image/elasticsearch_logging_discovery.go#L56 but, on k8s 1.3.7 at least, it is not automatically set. This PR gets it from the downward API.

**Release note**:

```NONE
```

cluster/addons/fluentd-elasticsearch/es-controller.yaml

@@ -38,6 +38,11 @@ spec:
         volumeMounts:
         - name: es-persistent-storage
           mountPath: /data
+        env:
+        - name: "NAMESPACE"
+          valueFrom:
+            fieldRef:
+              fieldPath: metadata.namespace
       volumes:
       - name: es-persistent-storage
         emptyDir: {}