Added RabbitMQ with clustering (#151)

templates/rabbitmq-3/0/README.md

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+RabbitMQ 3.6.1 with easy Rancher clustering
+===
+Provides RabbitMQ image that can scale to a cluster.
+
+TODO: 
+* avoid deployment on a node where the service is already present

templates/rabbitmq-3/0/docker-compose.yml

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+rabbitmq:
+  image: rancher/rabbitmq-conf:v0.1.0
+  labels:
+    io.rancher.container.hostname_override: container_name
+    io.rancher.sidekicks: rabbitmq-base,rabbitmq-datavolume
+  volumes_from:
+    - rabbitmq-datavolume
+rabbitmq-datavolume:
+  labels:
+    io.rancher.container.hostname_override: container_name
+    io.rancher.container.start_once: true
+  volumes:
+    - /etc/rabbitmq
+    - /opt/rancher/bin
+  entrypoint: /bin/true
+  image: rabbitmq:3.6.1-management
+rabbitmq-base:
+  labels:
+    io.rancher.container.hostname_override: container_name
+  image: rabbitmq:3.6.1-management
+  volumes_from:
+    - rabbitmq-datavolume
+  net: "container:rabbitmq"
+  entrypoint:
+    - /opt/rancher/bin/run.sh
+  environment:
+    - RABBITMQ_ERLANG_COOKIE=secretcookie

templates/rabbitmq-3/0/rancher-compose.yml

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+.catalog:
+  name: "Rabbit MQ"
+  version: "0.1.0"
+  decription: A reliable, distributed messaging broker
+rabbitmq:
+  metadata:
+    rabbitmq:
+      config:
+       node.name: "$${HOSTNAME}"
+

templates/rabbitmq-3/config.yml

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+name: RabbitMQ 3.6.1
+description: |
+  Robust messaging for applications 
+version: 0.1.0
+category: Message queues