[bot_update] show git protocol version

Bug: 875453
Change-Id: I2ddfc42a2fa79212fe7f9e10c8e81255c0181161
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/1530221
Commit-Queue: Takuto Ikuta <tikuta@chromium.org>
Reviewed-by: Andrii Shyshkalov <tandrii@chromium.org>

recipes/recipe_modules/bot_update/resources/bot_update.py

@@ -1036,6 +1036,12 @@ def checkout(options, git_slns, specs, revisions, step_text):
   ver = git('version').strip()
   print 'Using %s' % ver
 
+  try:
+    protocol = git('config', '--get', 'protocol.version')
+    print 'Using git protocol version %s' % protocol
+  except SubprocessFailed as e:
+    print 'git protocol version is not specified.'
+
   first_sln = git_slns[0]['name']
   dir_names = [sln.get('name') for sln in git_slns if 'name' in sln]
   try: