RFE: add new command line options and a new util from HPE fork

[xosevp]

From latest HPE code(HPE_StoreOpen_Software_3.4.2_Source_Z7550-02501.tar.gz), unofficial repo: https://github.com/nix-community/hpe-ltfs

• [ ] src/utils/ltfsck.c:

-w, --list-open-files
-c, --count-open-files
-F, --Force
-P, output rollback points formatted for a pipe process

• [ ] src/utils/mkltfs.c: -g, --interactive

• [x] src/utils/unltfs.c - "unformat" an LTFS volume

[piste-jp]

Unformat feature is already implemented by -w option of mkltfs.

    -w, --wipe
           Restore the LTFS medium to an unpartitioned medium (format to a legacy scratch medium)