message: test(http1): fix unused import warnings of Bytes when debug_assertions are off
diff: use std::fmt::{self, Write};
  use std::mem;
  -use bytes::{BytesMut, Bytes};
  +use bytes::{BytesMut};
  use http::header::{self, Entry, HeaderName, HeaderValue};
  use http::{HeaderMap, Method, StatusCode, Version};
  use httparse;
  @@ -20,7 +20,7 @@ macro_rules! header_name {
  {
  match HeaderName::from_bytes($bytes) {
  Ok(name) => name,
  - Err(_) => panic!("illegal header name from httparse: {:?}", Bytes::from($bytes)),
  + Err(_) => panic!("illegal header name from httparse: {:?}", ::bytes::Bytes::from($bytes)),
  }
  }
  @@ -36,7 +36,7 @@ macro_rules! header_value {
  ($bytes:expr) => ({
  #[cfg(debug_assertions)]
  {
  - let __hvb: Bytes = $bytes;
  + let __hvb: ::bytes::Bytes = $bytes;
  match HeaderValue::from_shared(__hvb.clone()) {
  Ok(name) => name,
  Err(_) => panic!("illegal header value from httparse: {:?}", __hvb),
  