pass also "release_type" product parameter (bnc#873194)

- 3.1.33

This is the Yast part of the fix.

Note: SCC uses `release_type` term, while libzypp `flavor` (see https://github.com/yast/yast-pkg-bindings/blob/master/src/Resolvable_Properties.cc#L376 and https://github.com/openSUSE/libzypp/blob/master/zypp/Product.h#L88)