gclient: fix PyChecker errors caused by r26423

gclient_utils.py

 # Copyright 2009 Google Inc.  All Rights Reserved.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
 # You may obtain a copy of the License at
 #
 #      http://www.apache.org/licenses/LICENSE-2.0
 #
 # Unless required by applicable law or agreed to in writing, software
 # distributed under the License is distributed on an "AS IS" BASIS,
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+import errno
 import os
 import stat
 import subprocess
 import sys
+import time
 import xml.dom.minidom
+import xml.parsers.expat
 
 ## Generic utils
 
 
 def ParseXML(output):
   try:
     return xml.dom.minidom.parseString(output)
   except xml.parsers.expat.ExpatError:
     return None
 
@@ skipping 201 matching lines @@
     raise Error(msg)
 
 
 def IsUsingGit(root, paths):
   """Returns True if we're using git to manage any of our checkouts.
   |entries| is a list of paths to check."""
   for path in paths:
     if os.path.exists(os.path.join(root, path, '.git')):
       return True
   return False