disable dialog matching for subscribe reqs so it always uses a new handle to avoid conflicting with notify transactions

Conflicts:
	libs/sofia-sip/.update

libs/sofia-sip/libsofia-sip-ua/nta/nta.c

@@ -2989,7 +2989,7 @@ void agent_recv_request(nta_agent_t *agent,
   url->url_params = NULL;
   agent_aliases(agent, url, tport); /* canonize urls */
 
-  if ((leg = leg_find(agent,
+  if (method != sip_method_subscribe && (leg = leg_find(agent,
 		      method_name, url,
 		      sip->sip_call_id,
 		      sip->sip_from->a_tag,