BZ #1167414 - rabbitmq tcp keepalive

https://bugzilla.redhat.com/show_bug.cgi?id=1167414

Set tcp_listen_options in /etc/rabbitmq/rabbitmq.config
Merge pull request #440 from cwolferh/bz1167414_rabbit_tcp_keepalive

BZ #1167414 - rabbitmq tcp keepalive