In package practice of most linux distribute, the `--prefix` is in `/usr/share` and in `nginx.conf` ,all relatively `include` is relative to `--conf-path` of `nginx.conf`
which make it possible to share a same `--prefix`,but with different nginx config file anywhere.
which make it more convince to pack the configs and drop it to anywhere to use without modify and config file
but,in `doc` of `ngx_lua` https://github.com/openresty/lua-nginx-module#init_by_lua_file it said:
When a relative path like foo/bar.lua is given, they will be turned into the absolute path relative to the server prefix path determined by the -p PATH command-line option while starting the Nginx server.
should it more reasonable to change the behavior to like `nginx` native 'include' directive
