LU-7214 lnet: Allow min stats to be reset in peers and nis

LU-7214 lnet: Allow min stats to be reset in peers and nis

Allow writes to the peers and nis LNet procfs files to
reset the mininum stat columns.

Signed-off-by: Doug Oucharek <doug.s.oucharek@intel.com>
Change-Id: Ic7aa647a154a424b35be1598266887d27efb4ab3
Reviewed-on: https://review.whamcloud.com/20470
Tested-by: Jenkins
Reviewed-by: Olaf Weber <olaf@sgi.com>
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Amir Shehata <amir.shehata@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>