Description
When configuring DFS with DFS NFS path generic.php file trying to load incorrect file dfs.yml

Steps to reproduce
1. Install clean eZ Platform v3

2. Configure env DB for DFS and DFS_NFS_PATH

3. Try to enter the site

Actual
Show error message: 

The file "dfs.yml" does not exist (in: "/var/www/html/config/packages/dfs") in /var/www/html/config/packages/overrides/generic.php (which is loaded in resource "/var/www/html/config/packages/overrides/generic.php").

Expected result
The site will load correctly without errors