Add tests for disklabel type selection and partition weight.
Add tests for disklabel type selection and partition weight.

jkonecny12/blivet,rvykydal/blivet,vojtechtrefny/blivet,rhinstaller/blivet,rvykydal/blivet,rhinstaller/blivet,jkonecny12/blivet,vojtechtrefny/blivet