zdtm.sh: fix absolute path to crtools

zdtm.sh launched by an absolute path exits with an error due to
an incorrect path to crtools
Signed-off-by: Andrey Vagin <avagin@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

test/zdtm.sh

@@ -132,7 +132,7 @@ static/inotify00
 $IPC_TEST_LIST
 "
 
-CRTOOLS=`pwd`/`dirname $0`/../crtools
+CRTOOLS=$(readlink -f `dirname $0`/../crtools)
 TINIT=`pwd`/`dirname $0`/zdtm/lib/test_init
 
 test -x $CRTOOLS || {