Add a default Isolate gRPC proxy in config

appengine/swarming/swarming_bot/bot_code/bot_main_test.py

 #!/usr/bin/env python
 # Copyright 2013 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.
 
 import copy
 import json
 import logging
 import os
 import sys
@@ skipping 292 matching lines @@
       ('Host is stuck rebooting for: Starting new swarming bot: %s\n'
        'Calling stack:\nfake stack') % bot_main.THIS_FILE,
     ]
     self.assertEqual(expected, [i[0][2] for i in post_event])
 
   def test_post_error_task(self):
     self.mock(time, 'time', lambda: 126.0)
     self.mock(logging, 'error', lambda *_, **_kw: None)
     self.mock(
         bot_main, 'get_config',
-        lambda: {'server': self.url, 'server_version': '1', 'is_grpc': False})
+        lambda: {'server': self.url, 'server_version': '1'})
     expected_attribs = bot_main.get_attributes(None)
     self.expected_requests(
         [
           (
             'https://localhost:1/swarming/api/v1/bot/task_error/23',
             {
               'data': {
                 'id': expected_attribs['dimensions']['id'][0],
                 'message': 'error',
                 'task_id': 23,
@@ skipping 75 matching lines @@
     botobj = [None]
     def get_bot(config):
       botobj[0] = orig(config)
       return botobj[0]
     self.mock(bot_main, 'get_bot', get_bot)
 
     self.mock(
         bot_main, 'get_config',
         lambda: {
           'enable_ts_monitoring': False,
-          'is_grpc': False,
           'server': self.url,
           'server_version': '1',
         })
     self.mock(
         bot_main, '_get_dimensions', lambda _: self.attributes['dimensions'])
     self.mock(os_utilities, 'get_state', lambda *_: self.attributes['state'])
 
     # pylint: disable=unused-argument
     class Popen(object):
       def __init__(
@@ skipping 506 matching lines @@
     self.assertEqual([[bot_main.THIS_FILE, 'start_slave', '--survive']], calls)
 
 
 if __name__ == '__main__':
   fix_encoding.fix_encoding()
   if '-v' in sys.argv:
     TestBotMain.maxDiff = None
   logging.basicConfig(
       level=logging.DEBUG if '-v' in sys.argv else logging.CRITICAL)
   unittest.main()