RabbitMQ: Add liveness probe to check ampq port open

This PS adds a check that the ampq port is open.

Change-Id: I79c298f50c67f4b7293e6767fc9c10a66aa7dcf8
Signed-off-by: Pete Birley <pete@port.direct>

rabbitmq/templates/bin/_rabbitmq-liveness.sh.tpl

@@ -21,5 +21,6 @@ set -e
 if [ -f /tmp/rabbit-disable-liveness-probe ]; then
    exit 0
 else
+   timeout 5 bash -c "true &>/dev/null </dev/tcp/${MY_POD_IP}/${PORT_AMPQ}"
    exec rabbitmqctl status
 fi

rabbitmq/templates/statefulset.yaml

@@ -171,6 +171,10 @@ spec:
               valueFrom:
                 fieldRef:
                   fieldPath: metadata.name
+            - name: MY_POD_IP
+              valueFrom:
+                fieldRef:
+                  fieldPath: status.podIP
             - name: RABBITMQ_USE_LONGNAME
               value: "true"
             - name: RABBITMQ_NODENAME