Deprecate lxc-checkpoint, lxc-kill and lxc-restart

Checkpoint/restart isn't currently supported, so let's not carry those
binaries around until we have proper CRIU support in the API.

lxc-kill is redundant with lxc-stop -k and has been known to confuse user.

Signed-off-by: Stéphane Graber <stgraber@ubuntu.com>
Acked-by: Serge E. Hallyn <serge.hallyn@ubuntu.com>
plamo: Improve template

* make simple
* change default download site to http://ftp.ring.gr.jp

Signed-off-by: TAMUKI Shoichi <tamuki@linet.gr.jp>
Signed-off-by: KATOH Yasufumi <karma@jazz.email.ne.jp>
Acked-by: Stéphane Graber <stgraber@ubuntu.com>