"init" in LXC opens /dev/null and then mounts devtmpfs in /dev,
so crtools can not resolve the path to the origin /dev/null.

crtools with the option --evasive-devices will check the origin
device and a new device are the same and if it's true, crtools will
dump a new path.

v2: add a description for the option
Signed-off-by: Andrey Vagin <avagin@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>