rabbitmq: Bind to all interfaces

The puppet module does not allow a list like the previously manually installed:
{tcp_listeners, [

{"127.0.0.1", 5672},
{"127.0.1.1", 5672},
{"192.168.100.104", 5672}]},

So that's a tad more open than before but should solve the current alerts
warning.

To be fair, i'd prefer to use the node's ip but i have yet to find the right
variable (facter says networking.ip...)