New example: Distributed task queue

Adds an example of using Kubernetes to build a distributed task queue
using Celery along with a RabbitMQ broker and Flower frontend.

Resolves: #1788

examples/celery-rabbitmq/celery-app-add/run_tasks.py

@@ -0,0 +1,13 @@
+import random
+import syslog
+import time
+
+from celery_conf import add
+
+while True:
+    x = random.randint(1, 10)
+    y = random.randint(1, 10)
+    res = add.delay(x, y)
+    time.sleep(5)
+    if res.ready():
+        res.get()