LU-6494 hsm: add support to lfs to remove by fid

LU-6494 hsm: add support to lfs to remove by fid

Once an archived file has been deleted from Lustre, the only way to
remove it from an archive is to access the archive and delete it.

Enhance lfs hsm_remove so it can take an archive id and a fid to
delete that file. The FID has to be known somehow before the file is
deleted.

The lfs hsm_remove command gains a mntpath option to point to the
Lustre mountpoint, and an archive ID option.

Signed-off-by: frank zago <fzago@cray.com>
Change-Id: Ib7c5ab07d66754c71038147aa4524fd3a737a88f
Reviewed-on: http://review.whamcloud.com/14581
Tested-by: Jenkins
Reviewed-by: Patrick Farrell <paf@cray.com>
Reviewed-by: Henri Doreau <henri.doreau@cea.fr>
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>