The ngx_http_realip_module module is used to change the client address and optional port to the one sent in the specified header fields.

so that the client IP is no longer the frontend IP, so rack
attack won't be blacklisting fontend IPs

coreutils
imagemagick
poppler

- removes wkhtmltopdf entry ;
  as cloudooo has a hack to use wkhtmltopdf
  (see 8b49da34 in cloudooo repository)

- removes useless mimetype entries ;
  OnlyOffice entries were also defined in the generic_cloudoo recipe.