lxc: new package

Linux Containers (LXC), provides the ability to group and isolate
of a set of processes in a jail by virtualizing and accounting the
kernel resources. It is similar to Linux-Vserver or Openvz.

Signed-off-by: Jérôme Pouiller <jezz@sysmic.org>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>