[rt46602] Miscellaneous changes to existing parallelised tests

Currently these tests are allow_query, rpzrecurse and serve-stale

1. Function to copy files and set port numbers renamed from copy_config
to copy_setports, as this is used to change the ports in Perl and Python
test scripts as well.
2. Changes to rpzrecurse/tests.sh to handle two calls to getopts (one to
parse port numbers, the other to parse rpzrecurse-specific options). Also
fixed various commands to use correct ports.
3. Updates to "clean.sh" scripts to ensure that all files created in the
test are removed.

bin/tests/system/serve-stale/tests.sh

@@ -335,7 +335,7 @@ status=`expr $status + $ret`
 n=`expr $n + 1`
 echo_i "updating ns1/named.conf ($n)"
 ret=0
-$SEDPORTS < ns1/named2.conf.in > ns1/named.conf
+copy_setports ns1/named2.conf.in ns1/named.conf
 if [ $ret != 0 ]; then echo_i "failed"; fi
 status=`expr $status + $ret`