devserver: module import cleanup

* Import statements re-grouped: standard lib, third party,
  project-local; separated by a single line, preceded by a single line
  and followed by two lines. Each group is sorted alphabetically.

* Removed unused imports.

BUG=None
TEST=Passes unit tests.

Change-Id: Iee4f78b1256457bd19b2c159a29763ba3404c272
Reviewed-on: https://gerrit.chromium.org/gerrit/33859
Reviewed-by: Chris Sosa <sosa@chromium.org>
Commit-Ready: Gilad Arnold <garnold@chromium.org>
Tested-by: Gilad Arnold <garnold@chromium.org>
diff --git a/gsutil_util_unittest.py b/gsutil_util_unittest.py
index a8b5cb8..0822e5d 100755
--- a/gsutil_util_unittest.py
+++ b/gsutil_util_unittest.py
@@ -6,11 +6,12 @@
 
 """Unit tests for gsutil_util module."""
 
-import mox
 import subprocess
 import time
 import unittest
 
+import mox
+
 import gsutil_util