Add another error code where gclient sync should retry.

scm.py

 # Copyright (c) 2011 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 """SCM-specific utility classes."""
 
 import cStringIO
 import glob
 import logging
 import os
@@ skipping 453 matching lines @@
             always=verbose,
             filter_fn=CaptureMatchingLines,
             stdout=stdout)
       except subprocess2.CalledProcessError:
         def IsKnownFailure():
           for x in failure:
             if (x.startswith('svn: OPTIONS of') or
                 x.startswith('svn: PROPFIND of') or
                 x.startswith('svn: REPORT of') or
                 x.startswith('svn: Unknown hostname') or
-                x.startswith('svn: Server sent unexpected return value')):
+                x.startswith('svn: Server sent unexpected return value') or
+                x.startswith('svn: Can\'t connect to host')):
               return True
           return False
 
         # Subversion client is really misbehaving with Google Code.
         if args[0] == 'checkout':
           # Ensure at least one file was checked out, otherwise *delete* the
           # directory.
           if len(file_list) == previous_list_len:
             if not IsKnownFailure():
               # No known svn error was found, bail out.
@@ skipping 498 matching lines @@
       if (file_status[0][0] in ('D', 'A', '!') or
           not file_status[0][1:].isspace()):
         # Added, deleted file requires manual intervention and require calling
         # revert, like for properties.
         try:
           SVN.Capture(['revert', file_status[1]], cwd=repo_root)
         except subprocess2.CalledProcessError:
           if not os.path.exists(file_path):
             continue
           raise