- bringing liblustre to use fids like llite does - just to not lost changes and do...

- bringing liblustre to use fids like llite does - just to not lost changes and do not do them later;
- fix all legacy res_id.name generation in both llite and liblustre;
- get rid of ino and generation in mdt_body;
- cleanups about using fids in llite and liblustre;
- remove ll_test_inode() - we can live without it;