virttest.utils_libguestfs: Add libguestfs function

sfdisk, sfdisk_l, sfdisk_N, sfdiskM,
sfdisk_kernel_geometry, sfdisk_disk_geometry
virttest.utils_libguestfs: Add 5 function interface

lvs_full, lvm_clear_filter, lvm_remove_all,
lvm_set_filter, lvresize_free
Merge pull request #1669 from vanbogithub/bfan-next

virttest.utils_libguestfs: Add libguestfs function