roll "common" DEPS, and replace tools/pyutils with it

gm/rebaseline_server/fix_pythonpath.py

Index: gm/rebaseline_server/fix_pythonpath.py
diff --git a/gm/rebaseline_server/fix_pythonpath.py b/gm/rebaseline_server/fix_pythonpath.py
index ed578ced1017a2047c4929b3267b4c1a052d2a74..cc32f4a6bcf3fa075ac3534a85e06c60ca4347ad 100755
--- a/gm/rebaseline_server/fix_pythonpath.py
+++ b/gm/rebaseline_server/fix_pythonpath.py
@@ -6,16 +6,15 @@ Copyright 2014 Google Inc.
 Use of this source code is governed by a BSD-style license that can be
 found in the LICENSE file.
 
-Adds [trunk]/gm and [trunk]/tools to PYTHONPATH, if they aren't already there.
+Adds possibly-needed directories to PYTHONPATH, if they aren't already there.
 """
 
 import os
 import sys
 
-TRUNK_DIRECTORY = os.path.dirname(os.path.dirname(os.path.dirname(__file__)))
-GM_DIRECTORY = os.path.join(TRUNK_DIRECTORY, 'gm')
-TOOLS_DIRECTORY = os.path.join(TRUNK_DIRECTORY, 'tools')
-if GM_DIRECTORY not in sys.path:
-  sys.path.append(GM_DIRECTORY)
-if TOOLS_DIRECTORY not in sys.path:
-  sys.path.append(TOOLS_DIRECTORY)
+TRUNK_DIRECTORY = os.path.abspath(os.path.join(
+    os.path.dirname(__file__), os.pardir, os.pardir))
+for subdir in ['common', 'gm', 'tools']:
+  fullpath = os.path.join(TRUNK_DIRECTORY, subdir)
+  if fullpath not in sys.path:
+    sys.path.append(fullpath)