LXC requires newuidmap and newguidmap with SUID to run unprivileged
containers. This package should help users make sure they are available.

Signed-off-by: Rafał Miłecki <rafal@milecki.pl>

Normally LXC uses /var/lib, but due to hack OpenWRT employs this is not an
option. But instead of introducing new top-level directory, FSH compatible /srv
can be used.

Signed-off-by: Michal Hrusecky <michal.hrusecky@nic.cz>

Standard LXC autostart is currently not working in OpenWrt,
therefore add our own autostart mechanism for now.

Signed-off-by: Daniel Dickinson <openwrt@daniel.thecshore.com>

Signed-off-by: Luka Perkov <luka@openwrt.org>