**This is a shadowsocks server service, not client service.**
If you need client service, please modify ssserver to sslocal.
For those who wonder why I didn't use the -d start/stop/restart instead
of using forking type of service, shadowsocks defaults writes to a log
file under daemon mode instead of output to stdout/stderr, which can't
be captured by systemd, so I use the simple mode and keep shadowsocks
foreground.
