- Set valid flags in llite and not OSC. It does not make sense for the OSC

- Set valid flags in llite and not OSC.  It does not make sense for the OSC
  layer to be needed for llite->OBD operations to work properly.
- Set LOV EA size in mds_reint_unlink, so we use the EA data to unlink object.
- Remove extNisms from MDS code (mds_fs_get_md()) will return status if
  there is an available EA, and what size it is.
- Handle error on open intent, to avoid spurious actions on non-existent file.
- Rename OBD_MD_FLOBJID to OBD_MD_FLEASIZE to more accurately name it.