Make "--no-packages-dir" the default.

test/get/hosted/unlock_if_version_doesnt_exist_test.dart

Index: test/get/hosted/unlock_if_version_doesnt_exist_test.dart
diff --git a/test/get/hosted/unlock_if_version_doesnt_exist_test.dart b/test/get/hosted/unlock_if_version_doesnt_exist_test.dart
index c48f071feeb0fd99c364816946281fd2551a41c6..b587c1a793a861111f449da08d54a79dbb52fd25 100644
--- a/test/get/hosted/unlock_if_version_doesnt_exist_test.dart
+++ b/test/get/hosted/unlock_if_version_doesnt_exist_test.dart
@@ -16,12 +16,12 @@ main() {
 
     d.appDir({"foo": "any"}).create();
     pubGet();
-    d.packagesDir({"foo": "1.0.0"}).validate();
+    d.appPackagesFile({"foo": "1.0.0"}).validate();
 
     schedule(() => deleteEntry(p.join(sandboxDir, cachePath)));
 
     globalPackageServer.replace((builder) => builder.serve("foo", "1.0.1"));
     pubGet();
-    d.packagesDir({"foo": "1.0.1"}).validate();
+    d.appPackagesFile({"foo": "1.0.1"}).validate();
   });
 }