LU-9727 lustre: record if enable_audit is set on nodemap

LU-9727 lustre: record if enable_audit is set on nodemap

Record changelogs from a client only if it pertains to a nodemap
on which enable_audit is set, and changelogs are activated.
If client is not explicitely assigned to a nodemap, enable_audit value
from default nodemap is used.

Signed-off-by: Sebastien Buisson <sbuisson@ddn.com>
Change-Id: I31d361cfd8cc69db68b60298934cbbef4af0d75d
Reviewed-on: https://review.whamcloud.com/28314
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Reviewed-by: Li Xi <lixi@ddn.com>