[master] use posix-compatible shell in system tests

3839.	[test]		Use only posix-compatible shell in system tests.
			[RT #35625]

bin/tests/system/dnssec/ns1/sign.sh

@@ -15,8 +15,6 @@
 # OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
 # PERFORMANCE OF THIS SOFTWARE.
 
-# $Id: sign.sh,v 1.37 2011/05/03 16:07:44 marka Exp $
-
 SYSTEMTESTTOP=../..
 . $SYSTEMTESTTOP/conf.sh
 
@@ -24,8 +22,8 @@ zone=.
 infile=root.db.in
 zonefile=root.db
 
-(cd ../ns2 && sh sign.sh )
-(cd ../ns6 && sh sign.sh )
+(cd ../ns2 && $SHELL sign.sh )
+(cd ../ns6 && $SHELL sign.sh )
 
 cp ../ns2/dsset-example. .
 cp ../ns2/dsset-dlv. .

bin/tests/system/dnssec/ns2/sign.sh

@@ -15,8 +15,6 @@
 # OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
 # PERFORMANCE OF THIS SOFTWARE.
 
-# $Id: sign.sh,v 1.50 2011/11/04 05:36:28 each Exp $
-
 SYSTEMTESTTOP=../..
 . $SYSTEMTESTTOP/conf.sh
 
@@ -26,7 +24,7 @@ zonefile=example.db
 
 # Have the child generate a zone key and pass it to us.
 
-( cd ../ns3 && sh sign.sh )
+( cd ../ns3 && $SHELL sign.sh )
 
 for subdomain in secure bogus dynamic keyless nsec3 optout nsec3-unknown \
     optout-unknown multiple rsasha256 rsasha512 kskonly update-nsec3 \

bin/tests/system/dnssec/prereq.sh

@@ -15,4 +15,7 @@
 # OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
 # PERFORMANCE OF THIS SOFTWARE.
 
-exec sh ../testcrypto.sh
+SYSTEMTESTTOP=..
+. $SYSTEMTESTTOP/conf.sh
+
+exec $SHELL ../testcrypto.sh

bin/tests/system/dnssec/setup.sh

@@ -18,11 +18,11 @@
 SYSTEMTESTTOP=..
 . $SYSTEMTESTTOP/conf.sh
 
-sh clean.sh 
+$SHELL clean.sh 
 
 test -r $RANDFILE || $GENRANDOM 400 $RANDFILE
 
-cd ns1 && sh sign.sh
+cd ns1 && $SHELL sign.sh
 
 echo "a.bogus.example.	A	10.0.0.22" >>../ns3/bogus.example.db.signed