io/ManyEchoServerTest imports script without library declaration

[peter-ahe-google]

tests/standalone/src/io/ManyEchoServerTest.dart:7:1: error: no #library tag found in tests/standalone/src/io/EchoServerTest.dart

import("EchoServerTest.dart", prefix: "single");

^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

I think it is an easy fix, just add this line to tests/standalone/src/io/EchoServerTest.dart:

library("EchoServerTest");

[peter-ahe-google]

cc @sgjesse.

[sgjesse]

Fixed in r5815.

---

Added Fixed label.

[kevmoo]

Removed Area-IO label.
Added Area-Library, Library-IO labels.