Bug 16357: (QA follow-up) Add log4perl configs during package upgrade

Bug 16357: (QA follow-up) Add log4perl configs during package upgrade

If plack.psgi is updated to the newer version and the log4perl.conf file
is not then the warnings will not be logged anywhere. This adds the
log4perl configurations that are needed for logging for pre-existing Koha
installation which are upgraded.

Signed-off-by: Arthur Suzuki <arthur.suzuki@biblibre.com>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>