Add an e2e test for gce pd.

Add an example for gce pd.
Add an extra log message.

examples/gce-pd/testpd.yaml

@@ -0,0 +1,22 @@
+apiVersion: v1beta1
+desiredState:
+  manifest:
+    containers:
+      - image: kubernetes/pause
+        name: testpd
+        volumeMounts:
+          - mountPath: "/testpd"
+            name: "testpd"
+    id: testpd
+    version: v1beta1
+    volumes:
+      - name: testpd
+        source:
+          persistentDisk:
+            # This GCE PD must already exist and be formatted ext4
+            pdName: "%insert_pd_name_here%"
+            fsType: ext4
+id: testpd
+kind: Pod
+labels:
+  test: testpd