Add a common setup script for ksr

The previous setup.sh has been moved to ns1/setup.sh, we need a common
setup script to invoke ns1/setup.sh.

(cherry picked from commit 748d98e387)

bin/tests/system/ksr/setup.sh

@@ -0,0 +1,26 @@
+#!/bin/sh -e
+
+# Copyright (C) Internet Systems Consortium, Inc. ("ISC")
+#
+# SPDX-License-Identifier: MPL-2.0
+#
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0.  If a copy of the MPL was not distributed with this
+# file, you can obtain one at https://mozilla.org/MPL/2.0/.
+#
+# See the COPYRIGHT file distributed with this work for additional
+# information regarding copyright ownership.
+
+# shellcheck source=conf.sh
+. ../conf.sh
+
+set -e
+
+$SHELL clean.sh
+
+copy_setports ns1/named.conf.in ns1/named.conf
+
+(
+  cd ns1
+  $SHELL setup.sh
+)