findmnt: add FREQ and PASSNO columns

 ... to provide all information from fstab.

Reported-by: Roger Leigh <rleigh@codelibre.net>
Signed-off-by: Karel Zak <kzak@redhat.com>
arch: remove the command, deprecated since 2.13, use coreutils version

Signed-off-by: Karel Zak <kzak@redhat.com>
chkdupexe: remove, deprecated for years

Signed-off-by: Karel Zak <kzak@redhat.com>