zdtm: return back tun test to auto-list

The kernel was compiled without the tun driver.

This reverts commit 889a2129.
Signed-off-by: Andrew Vagin <avagin@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

test/zdtm.sh

@@ -116,6 +116,7 @@ static/shm
 static/msgque
 static/sem
 transition/ipc
+ns/static/tun
 "
 
 TEST_CR_KERNEL="