refactor(lib): improve client and h1 logs

src/client/connect/http.rs

@@ -452,7 +452,11 @@ impl ConnectingTcpRemote {
         loop {
             if let Some(ref mut current) = self.current {
                 match current.poll() {
-                    Ok(ok) => return Ok(ok),
+                    Ok(Async::Ready(tcp)) => {
+                        debug!("connected to {:?}", tcp.peer_addr().ok());
+                        return Ok(Async::Ready(tcp));
+                    },
+                    Ok(Async::NotReady) => return Ok(Async::NotReady),
                     Err(e) => {
                         trace!("connect error {:?}", e);
                         err = Some(e);

src/client/mod.rs

@@ -528,6 +528,7 @@ where C: Connect + Sync + 'static,
                         .http2_only(is_h2)
                         .handshake(io)
                         .and_then(move |(tx, conn)| {
+                            trace!("handshake complete, spawning background dispatcher task");
                             let bg = executor.execute(conn.map_err(|e| {
                                 debug!("client connection error: {}", e)
                             }));

src/client/pool.rs

@@ -680,6 +680,7 @@ impl<T: Poolable> Future for Checkout<T> {
 impl<T> Drop for Checkout<T> {
     fn drop(&mut self) {
         if self.waiter.take().is_some() {
+            trace!("checkout dropped for {:?}", self.key);
             if let Some(Ok(mut inner)) = self.pool.inner.as_ref().map(|i| i.lock()) {
                 inner.clean_waiters(&self.key);
             }