luci-py/isolateserver.py: Add archive support when downloading.

appengine/swarming/server/bot_archive.py

 # Copyright 2014 The LUCI Authors. All rights reserved.
 # Use of this source code is governed under the Apache License, Version 2.0
 # that can be found in the LICENSE file.
 
 """Generates the swarming_bot.zip archive for the bot.
 
 Unlike the other source files, this file can be run from ../tools/bot_archive.py
 stand-alone to generate a swarming_bot.zip for local testing so it doesn't
 import anything from the AppEngine SDK.
 
@@ skipping 33 matching lines @@
     'bot_code/file_refresher.py',
     'bot_code/remote_client.py',
     'bot_code/singleton.py',
     'bot_code/task_runner.py',
     'client/auth.py',
     'client/cipd.py',
     'client/isolated_format.py',
     'client/isolateserver.py',
     'client/run_isolated.py',
     'config/__init__.py',
+    'libs/arfile/arfile.py',
+    'libs/arfile/__init__.py',
+    'libs/__init__.py',
     'third_party/__init__.py',
     'third_party/colorama/__init__.py',
     'third_party/colorama/ansi.py',
     'third_party/colorama/ansitowin32.py',
     'third_party/colorama/initialise.py',
     'third_party/colorama/win32.py',
     'third_party/colorama/winterm.py',
     'third_party/depot_tools/__init__.py',
     'third_party/depot_tools/fix_encoding.py',
     'third_party/depot_tools/subcommand.py',
@@ skipping 235 matching lines @@
       h.update(str(len(name)))
       h.update(name)
       h.update(str(len(content)))
       h.update(content)
   except IOError:
     logging.warning('Missing expected file. Hash will be invalid.')
   bot_version = h.hexdigest()
   logging.info(
       'get_swarming_bot_version(%s) = %s', sorted(additionals), bot_version)
   return bot_version