Docker is blocking network of existing LXC containers / there is a conflict in
the iptables setup of Docker & LXC. With this patch:
- utils/lxc.sh checks internet connectivity (instead of silently hang)
- Chapter "Internet Connectivity & Docker" describes the problem and made a
suggestion for a solution a solution
Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>