* Reuse UDP port and open multiple sockets for transaction address
* Fixed failing crdt tests
* Add tests for reusing UDP ports
* Address review comments
* Updated bench-streamer to use multiple receive sockets
* Fix minimum number of recv sockets for bench-streamer
* Address review comments
Fixes#1132
* Moved bind_to function to nat.rs
* move gossip/NCP off assuming anything about its address
* use a single socket to send and receive gossip
* remove --addr/-a from CLIs
* rearrange networking utility code
* use Arc<UdpSocket> to share the Sync-safe UdpSocket among threads
* rename TestNode to Node
TODO:
* re-enable 127.0.0.1 as a valid address in crdt
* change repair request/response to a similar, single socket
* pick cloned sockets or Arc<UdpSocket> for all these (rpu uses tryclone())
* update contact_info with network truthiness instead of what the node
says?
Pankaj Garg
Rob Walker
Greg Fitzgerald