Respect git's ignore rules pervasively in pub.

sdk/lib/_internal/pub/test/build/preserves_htaccess_test.dart

-// Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS d.file
+// Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
+import 'package:scheduled_test/scheduled_test.dart';
+
 import '../descriptor.dart' as d;
 import '../test_pub.dart';
 
 main() {
   initConfig();
-  integration("omits source maps from a release build", () {
+
+  integration("preserves .htaccess as a special case", () {
     d.dir(appPath, [
       d.appPubspec(),
-      d.dir("web", [
-        d.file("main.dart", "void main() => print('hello');")
+      d.dir('web', [
+        d.file('.htaccess', 'fblthp'),
+        d.file('.hidden', 'asdfgh')
       ])
     ]).create();
 
     schedulePub(args: ["build"],
-        output: new RegExp(r'Built 2 files to "build".'),
-        exitCode: 0);
+        output: new RegExp(r'Built \d+ files? to "build".'));
 
     d.dir(appPath, [
       d.dir('build', [
         d.dir('web', [
-          d.nothing('main.dart.js.map')
+          d.file('.htaccess', 'fblthp'),
+          d.nothing('.hidden')
         ])
       ])
     ]).validate();
   });
 }