TCPGOSSIP uses a fixed port_range of 1

TCPGOSSIP has a list of GossipRouters in initial_hosts. A fixed port_range of 1 is used to compute the list. This is incorrect, as from A:1,B:1, we'll get A:1, A:2, B:1, B:2.
The idea is to list all GossipRouters in initial_hosts. Simple fix: use a fixed port_range of 0.