Validator to leader (#1303)

* Add check in window_service to exit in checks for leader rotation, and propagate that service exit up to fullnode

* Added logic to shutdown Tvu once ReplicateStage finishes

* Added test for successfully shutting down validator and starting up leader

* Add test for leader validator interaction

* fix streamer to check for exit signal before checking socket again to prevent busy leaders from never returning

* PR comments - Rewrite make_consecutive_blobs() function, revert genesis function change

src/streamer.rs

@@ -27,6 +27,11 @@ fn recv_loop(
     loop {
         let msgs = re.allocate();
         loop {
+            // Check for exit signal, even if socket is busy
+            // (for instance the leader trasaction socket)
+            if exit.load(Ordering::Relaxed) {
+                return Ok(());
+            }
             let result = msgs.write().recv_from(sock);
             match result {
                 Ok(()) => {
@@ -39,11 +44,7 @@ fn recv_loop(
                     channel.send(msgs)?;
                     break;
                 }
-                Err(_) => {
-                    if exit.load(Ordering::Relaxed) {
-                        return Ok(());
-                    }
-                }
+                Err(_) => (),
             }
         }
     }