Updating Spark Example.

Few usability improvements:

- Added a proxy to enable viewing worker logs
- Removed seperate webui service
- Modified Zeppelin and spark-ui services to be Loadbalancers
- Changed pyspark example to be platform agnostic
- Improved kubectl context setup
- Minor grammar/flow fixes

examples/spark/spark-ui-proxy-controller.yaml

@@ -0,0 +1,30 @@
+kind: ReplicationController
+apiVersion: v1
+metadata:
+  name: spark-ui-proxy-controller
+  namespace: spark-cluster
+spec:
+  replicas: 1
+  selector:
+    component: spark-ui-proxy
+  template:
+    metadata:
+      labels:
+        component: spark-ui-proxy
+    spec:
+      containers:
+        - name: spark-ui-proxy
+          image: elsonrodriguez/spark-ui-proxy:1.0
+          ports:
+            - containerPort: 80
+          resources:
+            requests:
+              cpu: 100m
+          args:
+            - spark-master:8080
+          livenessProbe:
+              httpGet:
+                path: /
+                port: 80
+              initialDelaySeconds: 120
+              timeoutSeconds: 5