zdtm: execute mntns_root_bind only if mnt_id is shown

Signed-off-by: Andrew Vagin <avagin@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

test/zdtm.sh

@@ -185,7 +185,6 @@ static/cgroup01
 static/cgroup02
 ns/static/clean_mntns
 static/remap_dead_pid
-ns/static/mntns_root_bind
 "
 
 TEST_CR_KERNEL="