Fix a bunch of pub tests that started running "pub get".

test/barback/all_includes_all_default_directories_test.dart

Index: test/barback/all_includes_all_default_directories_test.dart
diff --git a/test/barback/all_includes_all_default_directories_test.dart b/test/barback/all_includes_all_default_directories_test.dart
index 9e96e5417df337c708f172891158923c1dd7bf7a..1cc0c0a6f005f46490a15f3fc1cb56fc971a4450 100644
--- a/test/barback/all_includes_all_default_directories_test.dart
+++ b/test/barback/all_includes_all_default_directories_test.dart
@@ -49,7 +49,7 @@ main() {
   });
 
   integration("serve --all finds assets in default source directories", () {
-    pubServe(args: ["--all"]);
+    pubServe(args: ["--all"], shouldGetFirst: true);
 
     requestShouldSucceed("file.txt", "benchmark", root: "benchmark");
     requestShouldSucceed("file.txt", "bin", root: "bin");