add Documentation entries to lxc and lxc@ units Signed-off-by: Evgeni Golov <evgeni@debian.org>

start containers in foreground when using the lxc@.service lxc-start started to default to daemonize the container when starting this conflicts with type=simple of the systemd unit call lxc-start with -F and thus force execution in foreground that way we can feed the log to journald properly and keep type=simple Debian-Bug: https://bugs.debian.org/826100 Signed-off-by: Evgeni Golov <evgeni@golov.de>

Add instanced systemd service Signed-off-by: Cameron Norman <camerontnorman@gmail.com>