Copied coverage setup verbatim from yast-registration
Removed registration specific bits.
Copied yast_stubs verbatim from yast-registration
Extended and used yast stubs to make test pass.

rspec 3 or 2.99 dislike Object.any_instance.stub
Stubbed also yast/scr yast/path.
Merge branch 'master' into unban-spec
Stubs to make unban_dialog_spec pass.