This update for python-pycups fixes the following issues:

- add BuildRequires: python-cups to printer driver packages. (bsc#735865)
Package /usr/lib/rpm/postscriptdriver.prov again, in the new "cups-rpm-helper"
subpackage. The file hasn't been packaged any more after the switch from
python-cups to python-pycups.

This update was imported from the SUSE:SLE-15:Update update project.