guestfish_block_dev: Add sfdisk, sfdisk-l, sfdiskM, sfdisk-N
guestfish_block_dev: Add sfdisk-disk-geometry,sfdisk-kernel-geometry
Add new file guestfish_lvm.cfg and guestfish_lvm.py for test lvm
related APIs
fix a issue that can not sfdisk for lvm
Merge pull request #153 from vanbogithub/bfan-dev

Add sfdisk related test cases