BUG/MINOR: stats: Set conn-stream/channel EOI flags at the end of request

This bug is the same than for the HTTP client. See "BUG/MINOR: httpclient:
Set conn-stream/channel EOI flags at the end of request" for details.

This patch must be backported as far as 2.0. But only CF_EOI must be set
because applets are not attached to a conn-stream on older versions.

(cherry picked from commit 3fa5d19d14e70986d366e7c21554a434c1daa64b)
Signed-off-by: Christopher Faulet <cfaulet@haproxy.com>
(cherry picked from commit 9262914ef6c8c5158ed99bd108beedf4df306572)
Signed-off-by: Christopher Faulet <cfaulet@haproxy.com>
diff --git a/src/stats.c b/src/stats.c
index 2e5a1d3..b0f1a68 100644
--- a/src/stats.c
+++ b/src/stats.c
@@ -4267,6 +4267,7 @@
 	if (appctx->st0 == STAT_HTTP_DONE) {
 		/* no more data are expected. Don't add TLR because mux-h1 will take care of it */
 		res_htx->flags |= HTX_FL_EOM;
+		res->flags |= CF_EOI;
 		appctx->st0 = STAT_HTTP_END;
 	}