rework of netwrk rendezvous

* rename NodeInfo field of Node from "data" to "info"
      (touches a lot of files)

  * update client to use gossip to find leader, a la drone

  * rework multinode scripts
      * move more stuff into rust
      * added usage to all
      * no more rsync unless you're a validator (TODO: whack that, too)
  * fullnode doesn't bail if drone isn't up yet, just keeps trying
  * drone doesn't bail if network isn't up yet, just keeps trying

tests/data_replicator.rs

@@ -18,7 +18,7 @@ use std::time::Duration;
 
 fn test_node(exit: Arc<AtomicBool>) -> (Arc<RwLock<Crdt>>, Ncp, UdpSocket) {
     let tn = Node::new_localhost();
-    let crdt = Crdt::new(tn.data.clone()).expect("Crdt::new");
+    let crdt = Crdt::new(tn.info.clone()).expect("Crdt::new");
     let c = Arc::new(RwLock::new(crdt));
     let w = Arc::new(RwLock::new(vec![]));
     let d = Ncp::new(&c.clone(), w, None, tn.sockets.gossip, exit).unwrap();