Revert "Remove tmpfiles snippet for /home and /srv"
    
    This reverts commit a76669ee222fc4374f14f7e2a6e9a28c5ad87c0e.
    
    People create /usr-only images by making an installation and only picking
    up /usr from it. In that case, the snippet is needed to re-recreate /home
    on the rootfs.