Move some common Ubuntu config This introduces a new /usr/share/lxc/config directory containing common configuration snippets. The two Ubuntu templates are then simplified to just include the relevant entries avoiding a whole lot of hardcoded cgroup, capabilities and mount points configuration. An extra comment is also added at the top of all generated configuration files telling the user to look at lxc.conf(5) for more information. Signed-off-by: Stéphane Graber <stgraber@ubuntu.com> Acked-by: Serge E. Hallyn <serge.hallyn@ubuntu.com>