cbuildbot: Move Buildbot printing functions to `cbuildbot_alerts` module

Move all of the cbuildbot-specific printing routines out of cros_logging
and in to a new submodule of cbuildbot. Fix up all usages of these
functions to point to the new location.

BUG=b:191490453
TEST=`run_tests`

Change-Id: I5f5f28256b89d2b0500c1c404e2718f33aceaa31
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/chromite/+/2973409
Tested-by: Chris McDonald <cjmcdonald@chromium.org>
Commit-Queue: Chris McDonald <cjmcdonald@chromium.org>
Reviewed-by: Mike Frysinger <vapier@chromium.org>
diff --git a/scripts/upload_prebuilts.py b/scripts/upload_prebuilts.py
index 8e2beec..4036e82 100644
--- a/scripts/upload_prebuilts.py
+++ b/scripts/upload_prebuilts.py
@@ -21,16 +21,17 @@
 import datetime
 import functools
 import glob
+import logging
 import multiprocessing
 import os
 import tempfile
 
-from chromite.lib import constants
+from chromite.cbuildbot import cbuildbot_alerts
 from chromite.cbuildbot import commands
 from chromite.lib import binpkg
 from chromite.lib import commandline
+from chromite.lib import constants
 from chromite.lib import cros_build_lib
-from chromite.lib import cros_logging as logging
 from chromite.lib import git
 from chromite.lib import gerrit
 from chromite.lib import gs
@@ -467,7 +468,7 @@
       link_name = 'Prebuilts[%s]: %s' % (self._target, self._version)
       url = '%s%s/index.html' % (gs.PUBLIC_BASE_HTTPS_URL,
                                  remote_location[len(gs.BASE_GS_URL):])
-      logging.PrintBuildbotLink(link_name, url)
+      cbuildbot_alerts.PrintBuildbotLink(link_name, url)
 
   def _UploadSdkTarball(self, board_path, url_suffix, prepackaged,
                         toolchains_overlay_tarballs,