This patch is going to replace the group name 'nogroup' with 'nobody' in
debian/shadowsocks-libev.service, and move file
'/etc/default/shadowsocks-libev' to '/etc/sysconfig/shadowsocks-libev'.
This is implemented by creating a text patch file. Not sure whether
there is a better approach.
it's not conflicted with shadowsocks-python now. users can install both python and libev
ports of shaowsocks now. but they should migrate their old configuration file from
/etc/shadowsocks/config.json to /etc/shadowsocks-libev/config.json