Changed oauth2 refresh logs wording

Changed the wording of logs from oauth2 refresh in both Chromite libs
and third_party oauth2client (which is deprecated).

BUG=chromium:878404
TEST=none

Change-Id: Icb75e029133c418f6e42c4f4395ab727da628a3a
Reviewed-on: https://chromium-review.googlesource.com/1194303
Commit-Ready: Alec Thilenius <athilenius@google.com>
Tested-by: Alec Thilenius <athilenius@google.com>
Reviewed-by: Jason Clinton <jclinton@chromium.org>
diff --git a/lib/auth.py b/lib/auth.py
index 496d8fb..a276950 100644
--- a/lib/auth.py
+++ b/lib/auth.py
@@ -193,7 +193,7 @@
 
     resp, content = self.http.request(*args, **kwargs)
     if resp.status in REFRESH_STATUS_CODES:
-      logging.info('Refreshing due to a %s', resp.status)
+      logging.info('OAuth token TTL expired, auto-refreshing')
 
       # Token expired, force token renew
       kwargs_copy = dict(self.kwargs, force_token_renew=True)
diff --git a/third_party/oauth2client/client.py b/third_party/oauth2client/client.py
index cd5959f..0bfe004 100644
--- a/third_party/oauth2client/client.py
+++ b/third_party/oauth2client/client.py
@@ -601,9 +601,10 @@
             for refresh_attempt in range(max_refresh_attempts):
                 if resp.status not in REFRESH_STATUS_CODES:
                     break
-                logger.info('Refreshing due to a %s (attempt %s/%s)',
-                            resp.status, refresh_attempt + 1,
-                            max_refresh_attempts)
+                logger.info(
+                    'OAuth token TTL expired, auto-refreshing (attempt %s/%s)',
+                    refresh_attempt + 1,
+                    max_refresh_attempts)
                 self._refresh(request_orig)
                 self.apply(headers)
                 if body_stream_position is not None: