LU-15047 gss: gss integrity check with multi-rail

LU-15047 gss: gss integrity check with multi-rail

With multi-rail, a primary NID is used as node identifier, but LNet
decides which NID is actually used for sending/receiving data, on a
per request basis.
For the integrity check mechanism implemented as part of GSS, the
primary NID must be used in order to compute HMAC with the correct
key, independently of the actual NID for the current request.

Lustre-change: https://review.whamcloud.com/45277
Lustre-commit: c8301a65c5672a1d081669343466746df983eabc

Signed-off-by: Sebastien Buisson <sbuisson@ddn.com>
Change-Id: I2bf3974d3aa0e8365a9413dca56c69ee3734c12b
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-on: https://review.whamcloud.com/c/ex/lustre-release/+/51274
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Andreas Dilger <adilger@whamcloud.com>