Fix all remaining clippy warnings

Fixes #586

tests/data_replicator.rs

@@ -21,7 +21,7 @@ fn test_node(exit: Arc<AtomicBool>) -> (Arc<RwLock<Crdt>>, Ncp, UdpSocket) {
     let c = Arc::new(RwLock::new(crdt));
     let w = Arc::new(RwLock::new(vec![]));
     let d = Ncp::new(
-        c.clone(),
+        &c.clone(),
         w,
         tn.sockets.gossip,
         tn.sockets.gossip_send,

tests/multinode.rs

@@ -35,7 +35,7 @@ fn converge(leader: &NodeInfo, num_nodes: usize) -> Vec<NodeInfo> {
     let spy_ref = Arc::new(RwLock::new(spy_crdt));
     let spy_window = default_window();
     let ncp = Ncp::new(
-        spy_ref.clone(),
+        &spy_ref.clone(),
         spy_window,
         spy.sockets.gossip,
         spy.sockets.gossip_send,