Make bot_update on win more resilient

gclient.py

Index: gclient.py
diff --git a/gclient.py b/gclient.py
index 3e8a7962290a3b63832adc2ad3469ae7ad2d6a53..28ad7a7327af8f77a6354a913773c2f5a1969b69 100755
--- a/gclient.py
+++ b/gclient.py
@@ -1604,6 +1604,11 @@ def CMDcleanup(parser, args):
                     help='override deps for the specified (comma-separated) '
                          'platform(s); \'all\' will process all deps_os '
                          'references')
+  parser.add_option('--break_repo_locks', action='store_true',

[agable, 2016/10/28 16:55:34]

Honestly I wouldn't even bother with this. This will now be the sole purpose of
the 'cleanup' command, so there's no need for the flag.

[katthomas, 2016/10/28 23:40:29]

Done.

+                    help='GIT ONLY - Forcibly remove repo locks (e.g. '
+                      'index.lock). This should only be used if you know for '
+                      'certain that this invocation of gclient is the only '
+                      'thing operating on the git repos (e.g. on a bot).')
   (options, args) = parser.parse_args(args)
   client = GClient.LoadCurrentConfig(options)
   if not client: