[opensuse][migration]TW/zdup: version_switch_upgrade_target fails, as variables are not prepared
openQA test in scenario opensuse-Tumbleweed-NET-x86_64-zdup-13.1-gnome@64bit fails in
Fails since (at least) Build 20180113
Last good: 20180110 (or more recent)
Always latest result in this scenario: latest
https://github.com/os-autoinst/os-autoinst-distri-opensuse/pull/4181 introduced new code/logic, but setting the varibales only happens in main_sle.pm - openSUSE is thus not able to make use of this migrationm but still gets it loaded.