Ability to change setting cluster_partition_handling

[wasfree]

According to the documentation from rabbitmq it is not recommenced in all cases to use network partitions (see https://www.rabbitmq.com/partitions.html). So it should be possible to configure cluster_partition_handling to another value than autoheal. Right now it is hard coded to autoheal:

file://rabbitmq/files/rabbitmq.config

              {%- from "rabbitmq/map.jinja" import cluster with context %}
              {cluster_partition_handling, autoheal},
              {tcp_listen_options,
                        [binary,
                          {packet, raw},
                          {reuseaddr, true},
                          {backlog, 128},
                          {nodelay, true},
                          {exit_on_close, false},
                          {keepalive, true}
                         ]

My suggestion would be to leave it as default at autoheal. But in case someone need to change it, to do this via pillars. I will try to add an merge request in the next days to archive this.

[wasfree]

fixed in #41