Get rid of dirname dependency - 2nd edition

[pirat89]

PA is still dependent on name of directory (at least partially). The function get_proper_scenario (or in future it will be rename_custom_module_set based on PR #330) removes suffx -results from the module set dirname (e.g. RHEL6_7-results) when it is copied into the /root/preupgrade/ path. We should ignore any shape of the dirname as maybe someone would want to use exactly that suffix. And whats worse, what behaviour is now, when the directory has name exactly -results?