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-global.c b/src/cfgparse-global.c
index e076247..79058c6 100644
--- a/src/cfgparse-global.c
+++ b/src/cfgparse-global.c
@@ -904,7 +904,7 @@
                 }
 	}
 	else if (strcmp(args[0], "log") == 0) { /* "no log" or "log ..." */
-		if (!parse_logsrv(args, &global.logsrvs, (kwm == KWM_NO), &errmsg)) {
+		if (!parse_logsrv(args, &global.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;