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/queue.c b/src/queue.c
index 002b94b..97862f0 100644
--- a/src/queue.c
+++ b/src/queue.c
@@ -601,7 +601,7 @@
 
 	/* the entry might have been redistributed to another server */
 	if (!(strm->flags & SF_ADDR_SET))
-		sockaddr_free(&cs_si(strm->csb)->dst);
+		sockaddr_free(&strm->csb->dst);
 
 	if (p->target) {
 		/* a server picked this pendconn, it must skip LB */