MEDIUM: stream-int/conn-stream: Move src/dst addresses in the conn-stream

The source and destination addresses at the applicative layer are moved from
the stream-interface to the conn-stream. This simplifies a bit the code and
it is a logicial step to remove the stream-interface.
diff --git a/src/peers.c b/src/peers.c
index 9846612..4d86126 100644
--- a/src/peers.c
+++ b/src/peers.c
@@ -3209,7 +3209,7 @@
 	appctx_wakeup(appctx);
 
 	/* initiate an outgoing connection */
-	cs_si(s->csb)->dst = addr;
+	s->csb->dst = addr;
 	cs_si(s->csb)->flags |= SI_FL_NOLINGER;
 	s->flags = SF_ASSIGNED|SF_ADDR_SET;
 	s->target = peer_session_target(peer, s);