Revert "Fixed setup image version, Enterprise installation support"

See https://github.com/mageinferno/magento2-docker-compose/pull/51

This reverts commit c1ca67d6515928156277ed570369fca4c329033b.

docker-compose.yml

@@ -37,7 +37,7 @@ dbdata:
     - /var/lib/mysql
 
 setup:
-  image: mageinferno/magento2-php:7.1-fpm-0
+  image: mageinferno/magento2-php:7.0-fpm-0
   command: /usr/local/bin/mage-setup
   links:
     - db