For the purpose of adding some package(RPM) to the skiplist, there are
two option has introduced, skiplist_supplement_regex for adding package
if it has matched with the regex, skiplist_supplement_ignores in order
to free package from the regex rule.
Leap 15 Respin project doesn't have inherited packagelist,
skippkg-finder should have to check origin project but upload the result
to the working target project.
Example:
Checking openSUSE:Leap:15.3, upload data to
openSUSE:Leap:15.3:Update:Respin
The extra packages are packages should be skipped in ftp-tree but we
won't for some reasons, packagelist is not fixed depend on package
status in SLE side, move the list to OSRT attribute avoiding modify this
list so often.