tests: shell: delete flowtable after flushing chain

This patch adds a test to cover delete flowtable after chain flush
including two rule references to the flowtable.

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

diff --git a/tests/shell/testcases/flowtable/0011deleteafterflush_0 b/tests/shell/testcases/flowtable/0011deleteafterflush_0
new file mode 100755 (executable)
index 0000000..4f519a7
--- /dev/null
+++ b/tests/shell/testcases/flowtable/0011deleteafterflush_0
@@ -0,0 +1,10 @@
+#!/bin/bash
+
+set -e
+$NFT add table x
+$NFT add chain x y
+$NFT add flowtable x f { hook ingress priority 0\; devices = { lo }\;}
+$NFT add rule x y ip protocol tcp flow add @f
+$NFT add rule x y ip protocol udp flow add @f
+$NFT flush chain x y
+$NFT delete flowtable x f