fix test server for node 8, which changes keepalive connection handling

Author: David Frank

test/server.js

@@ -10,6 +10,9 @@ export default class TestServer {
 		this.server = http.createServer(this.router);
 		this.port = 30001;
 		this.hostname = 'localhost';
+		// node 8 default keepalive timeout is 5000ms
+		// make it shorter here as we want to close server quickly at the end of tests
+		this.server.keepAliveTimeout = 1000;
 		this.server.on('error', function(err) {
 			console.log(err.stack);
 		});