[telemetry] Sort imports in Telemetry and its dependents.

tools/telemetry/telemetry/user_story/user_story_runner_unittest.py

Index: tools/telemetry/telemetry/user_story/user_story_runner_unittest.py
diff --git a/tools/telemetry/telemetry/user_story/user_story_runner_unittest.py b/tools/telemetry/telemetry/user_story/user_story_runner_unittest.py
index 17bea6ded0e050120c6fa14449f12a46818e60e5..cc8489d375944ecc5a30a59b610b6dc979328c3f 100644
--- a/tools/telemetry/telemetry/user_story/user_story_runner_unittest.py
+++ b/tools/telemetry/telemetry/user_story/user_story_runner_unittest.py
@@ -2,12 +2,11 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
-import unittest
 import StringIO
 import sys
+import unittest
 
 from telemetry import benchmark
-from telemetry import user_story
 from telemetry.core import exceptions
 from telemetry.page import page as page_module
 from telemetry.page import page_test
@@ -15,6 +14,7 @@ from telemetry.page import test_expectations
 from telemetry.results import results_options
 from telemetry.unittest_util import options_for_unittests
 from telemetry.unittest_util import system_stub
+from telemetry import user_story
 from telemetry.user_story import shared_user_story_state
 from telemetry.user_story import user_story_runner
 from telemetry.user_story import user_story_set