Comment 2 for bug 1818260

In the bundle, rabbitmq-server min-cluster-size is set to 3.

rabbitmq-server:
    charm: cs:rabbitmq-server
    bindings:
      "": *oam-space
      amqp: *internal-space
      cluster: *internal-space
    options:
      source: *openstack-origin
      min-cluster-size: 3
    num_units: 3