[BUG] do not re-arm read timeout after writing data

A second occurrence of read-timeout rearming was present in stream_sock.c.
To fix the problem, it was necessary to put the shutdown information in
the buffer (already planned).
diff --git a/src/stream_sock.c b/src/stream_sock.c
index ae5993b..f5895b1 100644
--- a/src/stream_sock.c
+++ b/src/stream_sock.c
@@ -318,7 +318,8 @@
 			 * we refresh it. A solution would be to merge read+write timeouts into a
 			 * unique one, although that needs some study particularly on full-duplex
 			 * TCP connections. */
-			b->rex = b->wex;
+			if (!(b->flags & BF_SHUTR_STATUS))
+				b->rex = b->wex;
 			goto out_wakeup;
 		}
 	out_eternity: