Honor the LV segment type when creating it
Honor the LV segment type when creating it

This really only takes care about passing the type down to libblockdev and thus
lvcreate. We need to a lot more to actually fully support various types of LVs.

AdamWill/blivet,vpodzime/blivet,rhinstaller/blivet,AdamWill/blivet,jkonecny12/blivet,vojtechtrefny/blivet,vpodzime/blivet,rvykydal/blivet,rhinstaller/blivet,vojtechtrefny/blivet,rvykydal/blivet,jkonecny12/blivet