Remove "password" macro from ospf6d example config file.

OSPFv3 does not feature built-in authentication (it relies
on IPsec, see RFC4552) so the example was misleading.
ok claudio@ michele@

src/etc/ospf6d.conf

@@ -1,7 +1,4 @@
-# $OpenBSD: ospf6d.conf,v 1.1 2007/10/08 12:16:35 norby Exp $
-
-# macros
-password="secret"
+# $OpenBSD: ospf6d.conf,v 1.2 2010/01/08 15:12:48 stsp Exp $
 
 # global configuration
 # router-id 10.0.0.1