LU-17431 nodemap: introduce func to init nodemap properties

LU-17431 nodemap: introduce func to init nodemap properties

Introduce a specific function to initialize nodemap properties when
a new nodemap is created.

Test-Parameters: trivial
Test-Parameters: testlist=sanity-sec mdscount=2 mdtcount=4 osscount=1 ostcount=8 clientcount=2
Signed-off-by: Sebastien Buisson <sbuisson@ddn.com>
Change-Id: Ib2764e6b8a1cf035a6a8a723226859e35078989e
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/54742
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Arshad Hussain <arshad.hussain@aeoncomputing.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>