Add scripts for creating and destroying XIA linux containers

xlxc-create is a Ruby script that creates at least one IP or
XIA linux container, depending on the options given.

It is assumed that any linux containers created should be stored
in /var/lib/lxc; if this is not the case, the script should be
manually amended. It is also assumed that the type of containers
created should be running 64-bit Ubuntu Quantal Quetzal (12.10).

The script uses bind mounts to re-use key applications in the
containers that are present in the host. The script also installs
lxc and ruby in the container so that the host may run lxc-execute
on ruby scripts in the container. In order to communicate with
the containers, xlxc-create adds a separate ethernet bridge to
every container from the host.

The username/password for the container is set to ubuntu/ubuntu.

xlxc-destroy is also a Ruby script that stops and destroys any
IP or XIA linux containers matching the given command-line
arguments.