The kernel must be 3.11 or greater due to
29000cae ptrace: add ability to get/set signal-blocked mask (v2)

The patches for dumping tun devices are not committed in the upstream
kernel yet, so ns/static/tun is excluded.
Signed-off-by: Andrey Vagin <avagin@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>