Bug 15253: Remove specific logging output

Bug 15253: Remove specific logging output

* We should not call Log::Log4perl directly
* Not sure it is correct as I get from (comment 77):
 % koha-sip --restart

 [2020/04/23 11:23:27] [ERROR] [undef]@[undef]: Argument "0.33_01" isn't
 numeric in numeric lt (<) at /usr/share/perl5/Net/Server/Log/Sys/Syslog.pm
 line 42.
  C4::SIP::Trapper::PRINT /kohadevbox/koha/C4/SIP/Trapper.pm (24)

 Why "ERROR" when it's a warning?
 The [undef]@[undef] seems wrong here.

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