More interop test clean up

tonic-interop/src/server.rs

@@ -1,6 +1,6 @@
 use crate::pb::{self, *};
 use async_stream::try_stream;
-use futures_util::{TryStreamExt, StreamExt, stream};
+use futures_util::{stream, StreamExt, TryStreamExt};
 use std::pin::Pin;
 use std::time::{Duration, Instant};
 use tonic::{Code, Request, Response, Status};