MINOR: log: register config file and line number on log servers.

This patch registers the parsed file and the line where a log server
is declared to make those information available in configuration
post check.

Those new informations were added on error messages probed resolving
ring names on post configuration check.
diff --git a/src/cfgparse.c b/src/cfgparse.c
index 8f612ee..47f04e5 100644
--- a/src/cfgparse.c
+++ b/src/cfgparse.c
@@ -730,7 +730,7 @@
 			err_code |= ERR_ALERT | ERR_ABORT;
 			goto out;
 		}
-		if (!parse_logsrv(args, &curpeers->peers_fe->logsrvs, (kwm == KWM_NO), &errmsg)) {
+		if (!parse_logsrv(args, &curpeers->peers_fe->logsrvs, (kwm == KWM_NO), file, linenum, &errmsg)) {
 			ha_alert("parsing [%s:%d] : %s : %s\n", file, linenum, args[0], errmsg);
 			err_code |= ERR_ALERT | ERR_FATAL;
 			goto out;