Add support or blocking UPnP traffic (in and out).

conf/logging_ipv4.conf

@@ -27,7 +27,9 @@ log_spoofed=false
 log_spoofed_out=false
 log_to_lo=false
 log_not_wanted=false
-log_blocked=false
+log_blocked_ip=false
+log_blocked_if=false
+log_upnp=false
 log_unprotected=false
 log_prohibited=false
 log_voip=false