LU-10462 lod: Correct lfs --component-add striping

LU-10462 lod: Correct lfs --component-add striping

lfs --component-add -E <end> -c -1 would apply the default
stripe count to a file when it should be striping across
all OSTs. This was due to incorrect handling of sentinel
values in various portions of lod_object.

Lustre-change: https://review.whamcloud.com/30790
Lustre-commit: b7285d387c78fbd11579c577230593ba1b0be84e

Signed-off-by: Giuseppe Di Natale <dinatale2@llnl.gov>
Change-Id: I178f13be81ee546f44edcdadcf7086a1a57f7e9a
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Reviewed-by: Bobi Jam <bobijam@hotmail.com>
Signed-off-by: Minh Diep <minh.diep@intel.com>
Reviewed-on: https://review.whamcloud.com/31048
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: John L. Hammond <john.hammond@intel.com>