Fail immediatelly when clean.sh or setup.sh fails

The `statschannel/ns2/` was missing `manykeys.db.in`, but the test
succeeded even when `setup.sh` (or `clean.sh`) failed to execute.  This
commit makes run.sh to run in stricter mode and fail the test
immediately when `clean.sh` or `setup.sh` fails.

bin/tests/system/run.sh.in

@@ -187,6 +187,9 @@ if test -f "$systest/clean.sh"
 then
     if ! ( cd "${systest}" && $SHELL clean.sh "$@" ); then
 	echowarn "I:$systest:clean.sh script failed"
+	echofail "R:$systest:FAIL"
+	echoend  "E:$systest:$(date_with_args)"
+	exit 1
     fi
 
 fi
@@ -195,7 +198,10 @@ fi
 if test -f "$systest/setup.sh"
 then
     if ! ( cd "${systest}" && $SHELL setup.sh "$@" ); then
-	echowarn "I:$systest:clean.sh script failed"
+	echowarn "I:$systest:setup.sh script failed"
+	echofail "R:$systest:FAIL"
+	echoend  "E:$systest:$(date_with_args)"
+	exit 1
     fi
 fi