mod/lxc: Install lxc-extra by default on Redhat systems
mod/lxc: Install lxc-extra by default on Redhat systems

Signed-off-by: Christophe Vanlancker <e326f9f563002de800fc8506f2187bbb9dd743fc@inuits.eu>

carroarmato0/zanzilan-puppet,carroarmato0/zanzilan-puppet,carroarmato0/zanzilan-puppet,carroarmato0/zanzilan-puppet