staging: lustre: hsm: don't use real suppgid

In the MDC HSM handlers that do not pack a real suppgid, use -1 rather
than 0 for the suppgid in mdt_body.

Signed-off-by: John L. Hammond <john.hammond@intel.com>
Intel-bug-id: https://jira.hpdd.intel.com/browse/LU-3866
Reviewed-on: http://review.whamcloud.com/7565


Reviewed-by: Aurelien Degremont <aurelien.degremont@cea.fr>
Reviewed-by: Faccini Bruno <bruno.faccini@intel.com>
Reviewed-by: Jinshan Xiong <jinshan.xiong@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>
Signed-off-by: James Simmons <jsimmons@infradead.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>