No longer use 'use vars'

[bschmalhofer]

Handle the fallout from https://github.com/RotherOSS/CodePolicy/issues/102 which prohibits 'use vars'.
This is mostly relevant for the test scripts. In the code itself there is only a single occurence.

bes:~/devel/OTOBO/otobo (rel-11_0)$ grep -r 'use\s\+vars' Kernel/ bin/ scripts/ | grep -v cpan-lib | grep -v scripts/test
Kernel/System/Console/Command/Maint/GenericAgent/Run.pm:use vars qw(%Jobs);
Kernel/System/Console/Command/Dev/Code/Generate/UnitTest/Backend/Backend.t.skel:use vars (qw($Self));
Kernel/System/Console/Command/Dev/Code/Generate/ConsoleCommand/ConsoleCommand.t.skel:use vars (qw($Self));

[bschmalhofer]

Use the following command for batch editing the test scripts:

grep -rl 'use vars (qw($Self))' scripts/test/ | xargs -L 1 -- perl -pi -E 's/use vars \(qw\(\$Self\)\)/our \$Self/'

[bschmalhofer]

PR is merged and the unittests in rel-11_0 look fine. Closing this issue.