resolve: Remove comment when using resolvconf(8)

Since comments in resolv.conf are only valid at the beginning of a line
resolvconf(8) seems to have started treating any text after
'nameserver <ip>' as additional IP addresses for name servers.

Since it ignores comments, and we can easily remove the added servers
again, there is no point to add any.

Fixes #410.

src/libhydra/plugins/resolve/resolve_handler.c

@@ -170,8 +170,7 @@ static bool invoke_resolvconf(private_resolve_handler_t *this,
 			return FALSE;
 		}
 		DBG1(DBG_IKE, "installing DNS server %H via resolvconf", addr);
-		fprintf(out, "nameserver %H   # by strongSwan, from %Y\n", addr,
-				server);
+		fprintf(out, "nameserver %H\n", addr);
 		success = !ferror(out);
 		if (pclose(out))
 		{