fixup! ERP5/zopewsgi: Add option to set soft limit of open file descriptors to hard limit

In 39369169 the new option
'nofile' was added to set the soft limit of open file descriptors to its hard limit.
In slapos!1451 (comment 193296) it was criticized that
the name of the option - 'nofile' - is too vague and in slapos!1465 a new
name for the option was searched. Finally we agreed on the more explicit 'with-max-rlimit-nofile'.