Added support of linux containers namespace.
To use this feature you need:
1) Build start-stop-daemon with support of LXC
gcc start-stop-daemon.c -o start-stopp-daemon -DHAVE_LXC
2) Specify path to namespace in command line arguments with option --namespace
For example:
start-stop-daemon --namespace /var/run/netns/mgt --start --exec /usr/sbin/daemon
Where /var/run/netns/mgt is refers to namespace
You may create network namespace from command line:
ip netns add mgt