rc.local/update_jdn.sh: rework disabling dsa-check-packages

When rc.local was executed, it disables dsa-check-packages via
ln -sf /bin/true /usr/local/bin/dsa-check-packages which disables it.
But when the next time update_jdn.sh run, update_jdn.sh overwrite /bin/true
with the original dsa-check-packages perl script.
All scripts which use /bin/true rather than a built-in (like bash) might
fail if some packages are outdated.
Disabling of dsa-check-packages is done now in update_jdn.sh, but after
dsa-check-packages got overwritten. It's also now using a one line shell
script instead of a symbolic link, which allows to add a comment.
Also add temporary check if /bin/true is a perl script and repair it by
reinstalling coreutils.

Signed-off-by: Holger Levsen <holger@layer-acht.org>

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