Merge pull request #2366 from bybai/makedns_2

fix 2206 add comments in /etc/named.conf indicating that it is genera…

xCAT-server/lib/xcat/plugins/ddns.pm

@@ -1370,6 +1370,7 @@ sub update_namedconf {
     flock($newnameconf, LOCK_EX);
     seek($newnameconf, 0, 0);
     truncate($newnameconf, 0);
+    print $newnameconf "\#generated by xCAT: /opt/xcat/sbin/makedns -n \n";
     for my $l (@newnamed) { print $newnameconf $l; }
     flock($newnameconf, LOCK_UN);
     close($newnameconf);