Refactor: Extract function: _xccdf_session_load_xccdf_benchmark
Refactor: Extract function: _xccdf_session_load_xccdf_benchmark

This is one of the classy refactoring commits that decreases complexity
a lot. Enjoy the silence.

Hexadorsimal/openscap,jan-cerny/openscap,ybznek/openscap,ybznek/openscap,jan-cerny/openscap,jan-cerny/openscap,Hexadorsimal/openscap,OpenSCAP/openscap,openprivacy/openscap,jan-cerny/openscap,mpreisler/openscap,Hexadorsimal/openscap,openprivacy/openscap,redhatrises/openscap,Hexadorsimal/openscap,OpenSCAP/openscap,Hexadorsimal/openscap,openprivacy/openscap,ybznek/openscap,openprivacy/openscap,mpreisler/openscap,openprivacy/openscap,redhatrises/openscap,jan-cerny/openscap,mpreisler/openscap,mpreisler/openscap,redhatrises/openscap,OpenSCAP/openscap,OpenSCAP/openscap,ybznek/openscap,redhatrises/openscap,jan-cerny/openscap,redhatrises/openscap,OpenSCAP/openscap,redhatrises/openscap,mpreisler/openscap,Hexadorsimal/openscap,openprivacy/openscap,OpenSCAP/openscap,ybznek/openscap,ybznek/openscap,mpreisler/openscap