LU-16797 lnet: improve numeric NID to CPT hashing

LU-16797 lnet: improve numeric NID to CPT hashing

Testing shows that the sum-by-multiplication of nid bytes method for
hashing a NID to a CPT does not have good distribution for gnilnd
and kfilnd NIDs. For these LNDs, use the old hash_long() method.

Also modify lustre_lnet_calc_cpt_of_nid() to ensure the specified
number of CPTs is greater than 0. This avoids a divide by zero.

Test-Parameters: trivial
HPE-bug-id: LUS-11576
Signed-off-by: Chris Horn <chris.horn@hpe.com>
Change-Id: I77c6a5c3bc6b773e97f0a3c87182c31674d284e0
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/50862
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Serguei Smirnov <ssmirnov@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>