LU-14668 lnet: add 'lock_prim_nid" lnet module parameter

LU-14668 lnet: add 'lock_prim_nid" lnet module parameter

Add 'lock_prim_nid' lnet module parameter to allow control
of how Lustre peer primary NID is selected.
If set to 1 (default), the NID specified by Lustre when
calling LNet API is designated as primary for the peer,
allowing for non-blocking discovery in the background.
If set to 0, peer discovery is blocking until complete
and the NID listed first in discovery response is designated
as primary.

Lustre-change: https://review.whamcloud.com/50159
Lustre-commit: fc7a0d6013b46ebc17cdfdccc04a5d1d92c6af24

Signed-off-by: Serguei Smirnov <ssmirnov@whamcloud.com>
Change-Id: I6ed1cb0c637f4aa7a7340a6f01819ba9a85858f4
Reviewed-on: https://review.whamcloud.com/c/ex/lustre-release/+/50971
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Frank Sehr <fsehr@whamcloud.com>
Reviewed-by: Cyril Bordage <cbordage@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>