lib/fileutils: make close_all_fds() to be similar with close_range()

lib/fileutils: make close_all_fds() to be similar with close_range()

The util-linux close_all_fds() serves the same purpose as close_range()
that will over time obsolete local implementation completely.  For
upcoming few years it is best to have a fallback that uses same input
arguments as the new system call.  That allows surrounding code and
variables not to be affected by version of mass file descriptor closing
function.

Proposed-by: Karel Zak <kzak@redhat.com>
Reference: https://github.com/karelzak/util-linux/pull/1205#discussion_r534080128
Signed-off-by: Sami Kerola <kerolasa@iki.fi>