message: opt balancer TimeOut error message
diff: @@ -480,7 +480,7 @@ impl PingChecker {
  Err(err)
  }
  Err(..) => {
  - use std::io::{Error, ErrorKind};
  + use std::io::ErrorKind;
  // Timeout
  trace!(
  @@ -491,8 +491,7 @@ impl PingChecker {
  );
  // NOTE: timeout exceeded. Count as error.
  - let err = Error::new(ErrorKind::TimedOut, "Request timed out");
  - Err(err)
  + Err(ErrorKind::TimedOut.into())
  }
  }
  }
  