Currently, there is no option to specify different ports for each server in the configuration file. The same port is used for all the servers.
This PR adds the option to set a different port for each server defined in mcollective_hosts parameter. As example, this could be set in hiera:

mcollective::middleware_hosts:
  - server1
  - server2
mcollective::middlware_multiple_ports: true
mcollective::middleware_ports:
  - 61613
  - 61614

In this example, the configuration file will be like:

plugin.rabbitmq.pool.1.host = server1
plugin.rabbitmq.pool.1.port = 61613
plugin.rabbitmq.pool.2.host = server2
plugin.rabbitmq.pool.2.port = 61614