Add Consul example

examples/compose_consul_haproxy/README.md

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+RabbitMQ-Autoclsuter Consul example
+--
+Dynamic RabbitMQ cluster using:
+
+1. [Docker compose](https://docs.docker.com/compose/)
+
+2. [Consul](https://www.consul.io) 
+
+3. [HA proxy](https://github.com/docker/dockercloud-haproxy)
+
+
+Execute
+--
+```
+git clone https://github.com/rabbitmq/rabbitmq-autocluster.git .
+make dist
+docker build -t rabbitmq/rabbitmq-autocluster .
+cd  examples/compose_consul_haproxy 
+docker-compose up
+docker-compose scale rabbit=3
+```
+
+Check
+--
+
+Consul Management: http://localhost:8500/ui/ 
+RabbitMQ Management: http://localhost:15672/#/

examples/compose_consul_haproxy/docker-compose.yml

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+version: "2"
+services:
+   rabbit:
+    environment:
+      - RABBITMQ_ERLANG_COOKIE='secret_cookie'
+      - TCP_PORTS=15672, 5672
+      - AUTOCLUSTER_TYPE=consul
+      - AUTOCLUSTER_DELAY=60
+      - CONSUL_HOST=consul
+      - CONSUL_SVC_ADDR_AUTO=true
+      - AUTOCLUSTER_CLEANUP=true
+      - CLEANUP_WARN_ONLY=false
+      - CONSUL_DEREGISTER_AFTER=60 
+    networks:
+      - back
+    image: rabbitmq/rabbitmq-autocluster
+    expose:
+      - 15672
+      - 5672
+      - 5671
+      - 15671
+    tty: true
+    command:  sh -c "sleep 10; rabbitmq-server;" 
+   lb:
+    image: dockercloud/haproxy
+    environment:
+      - MODE=tcp
+    links:
+      - rabbit
+    volumes:
+      - /var/run/docker.sock:/var/run/docker.sock
+    ports:
+      - 15672:15672
+      - 5672:5672
+    networks:
+      - back
+   consul1:
+    image: "consul"
+    container_name: "consul"
+    hostname: "consul"
+    ports:
+      - "8400:8400"
+      - "8500:8500"
+      - "8600:53"
+    networks:
+      - back
+
+networks:
+  back: