devserver: Use chromite's logging library

We're removing cherrypy_log_util.py and its better to just use the
chromite's version of logging.

BUG=b:186066529
TEST=./devserver.py

Cq-Depend: chromium:2856532
Change-Id: Ibec85bb3f789baf831666c04405f4291d522176a
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/dev-util/+/2856530
Tested-by: Amin Hassani <ahassani@chromium.org>
Reviewed-by: Keith Haddow <haddowk@chromium.org>
Reviewed-by: Ivan Brovkovich <ivanbrovkovich@chromium.org>
Commit-Queue: Amin Hassani <ahassani@chromium.org>
diff --git a/health_checker.py b/health_checker.py
index 1f816c7..0cd13ce 100644
--- a/health_checker.py
+++ b/health_checker.py
@@ -26,13 +26,13 @@
   psutil = None
 
 import setup_chromite  # pylint: disable=unused-import
+from chromite.lib import cros_logging as logging
 from chromite.lib import cros_update_progress
-from chromite.lib.xbuddy import cherrypy_log_util
 
 
 def _Log(message, *args):
   """Module-local log function."""
-  return cherrypy_log_util.LogWithTag('HEALTHCHECKER', message, *args)
+  return logging.info(message, *args)
 
 # Number of seconds between the collection of disk and network IO counters.
 STATS_INTERVAL = 10.0