MINOR: log: add '%Tl' to log-format

The '%Tl' is similar to '%T', but using local timezone.
diff --git a/include/types/log.h b/include/types/log.h
index 8c28310..ce0c717 100644
--- a/include/types/log.h
+++ b/include/types/log.h
@@ -57,6 +57,7 @@
 	LOG_FMT_PID,
 	LOG_FMT_DATE,
 	LOG_FMT_DATEGMT,
+	LOG_FMT_DATELOCAL,
 	LOG_FMT_TS,
 	LOG_FMT_MS,
 	LOG_FMT_FRONTEND,