we need to fini the VDPs before continuing after a subreq

because, as in the case of pretendgz, they may be chaging the next
level up.

e00023 passes now

src/vdp_pesi.c

@@ -1456,6 +1456,7 @@ push_subreq(struct req *req, struct bytes_tree *tree,
 
 	VSLdbg(req, "DeliverObj from top");
 	VDP_DeliverObj(node->subreq.req);
+	VDP_close(node->subreq.req);
 
 	// fini_subreq() happening later