the first issue is there isn’t any php-fpm service listening on the port 8000.
php5.6-fpm listen on the port 9000, and php7.0-fpm on port 9070 with EasyEngine.
But why do you need to set fastcgi upstream manually ?
There are preconfigured upstream available, named php for php5.6-fpm and php7 for php7.0-fpm.
So you can directly use