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/cbuildbot.py b/scripts/cbuildbot.py
index ebed54d..4a2f13f 100644
--- a/scripts/cbuildbot.py
+++ b/scripts/cbuildbot.py
@@ -8,29 +8,30 @@
 full and pre-flight-queue builds.
 """
 
-import distutils.version # pylint: disable=import-error,no-name-in-module
+import distutils.version  # pylint: disable=import-error,no-name-in-module
 import glob
 import json
+import logging
 import optparse  # pylint: disable=deprecated-module
 import os
 import pickle
 import sys
 
 from chromite.cbuildbot import builders
+from chromite.cbuildbot import cbuildbot_alerts
 from chromite.cbuildbot import cbuildbot_run
 from chromite.cbuildbot import repository
 from chromite.cbuildbot import topology
 from chromite.cbuildbot.stages import completion_stages
 from chromite.cbuildbot.stages import test_stages
 from chromite.lib import builder_status_lib
-from chromite.lib import cidb
 from chromite.lib import cgroups
+from chromite.lib import cidb
 from chromite.lib import cleanup
 from chromite.lib import commandline
 from chromite.lib import config_lib
 from chromite.lib import constants
 from chromite.lib import cros_build_lib
-from chromite.lib import cros_logging as logging
 from chromite.lib import failures_lib
 from chromite.lib import git
 from chromite.lib import gob_util
@@ -858,7 +859,7 @@
   cros_build_lib.AssertOutsideChroot()
 
   if options.enable_buildbot_tags:
-    logging.EnableBuildbotMarkers()
+    cbuildbot_alerts.EnableBuildbotMarkers()
 
   if (options.buildbot and
       not options.debug and