template: Improved lxc-plamo template

lxc-plamo now work with any distribution other than Plamo Linux.

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