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

The '%Tl' is similar to '%T', but using local timezone.
diff --git a/src/haproxy.c b/src/haproxy.c
index bfbcb32..e252032 100644
--- a/src/haproxy.c
+++ b/src/haproxy.c
@@ -402,6 +402,7 @@
 	struct wordlist *wl;
 	char *progname;
 	char *change_dir = NULL;
+	struct tm curtime;
 
 	trash = malloc(global.tune.bufsize);
 
@@ -428,6 +429,10 @@
 	tv_update_date(-1,-1);
 	start_date = now;
 
+	/* Get the numeric timezone. */
+	get_localtime(start_date.tv_sec, &curtime);
+	strftime(localtimezone, 6, "%z", &curtime);
+
 	signal_init();
 	init_task();
 	init_session();