Isolate using the -T noaa flag only for part of the resolver test

Instead of running the whole resolver/ns4 server with -T noaa flag,
use it only for the part where it is actually needed.  The -T noaa
could interfere with other parts of the test because the answers don't
have the authoritative-answer bit set, and we could have false
positives (or false negatives) in the test because the authoritative
server doesn't follow the DNS protocol for all the tests in the resolver
system test.

bin/tests/system/resolver/ns4/named.noaa

@@ -1,12 +0,0 @@
-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.
-
-Add -T noaa.

bin/tests/system/resolver/tests.sh

@@ -221,6 +221,10 @@ done
 if [ $ret != 0 ]; then echo_i "failed"; fi
 status=$((status + ret))
 
+stop_server ns4
+touch ns4/named.noaa
+start_server --noclean --restart --port ${PORT} ns4 || ret=1
+
 n=$((n + 1))
 echo_i "RT21594 regression test check setup ($n)"
 ret=0
@@ -257,6 +261,10 @@ grep "status: NXDOMAIN" dig.ns5.out.${n} >/dev/null || ret=1
 if [ $ret != 0 ]; then echo_i "failed"; fi
 status=$((status + ret))
 
+stop_server ns4
+rm ns4/named.noaa
+start_server --noclean --restart --port ${PORT} ns4 || ret=1
+
 n=$((n + 1))
 echo_i "check that replacement of additional data by a negative cache no data entry clears the additional RRSIGs ($n)"
 ret=0