TESTS really fix T1040

This finally makes T1040 trigger the cmdsn overflow deadlock.
Its a bad idea to mangle on negotiated parameters as this leads
to protocol errors.
We also need to avoid overlapping writes as this leads also
to protocol errors.
Additionally we test with and with (if available) immediate data.

Signed-off-by: Peter Lieven <pl@kamp.de>

lib/socket.c

@@ -52,6 +52,7 @@ void
 iscsi_add_to_outqueue(struct iscsi_context *iscsi, struct iscsi_pdu *pdu)
 {
 	SLIST_ADD_END(&iscsi->outqueue, pdu);
+	return;
 }
 
 void iscsi_decrement_iface_rr() {