Don't try to apply connection-per-ip rate limiting to unix domain

sockets.  Instead of rejecting all unix domain connections when the
-C flag is given, allow them instead. Aragon tested an earlier
version of the patch.

PR:		109315
MFC after:	2 weeks
Tested-by:	Aragon Gouveia <aragon@phat.za.net>

usr.sbin/inetd/inetd.c

@@ -2222,6 +2222,7 @@ cpmip(const struct servtab *sep, int ctrl)
 	 */
 
 	if (sep->se_maxcpm > 0 && 
+	   (sep->se_family == AF_INET || sep->se_family == AF_INET6) &&
 	    getpeername(ctrl, (struct sockaddr *)&rss, &rssLen) == 0 ) {
 		time_t t = time(NULL);
 		int hv = 0xABC3D20F;