LU-10391 lnet: change lr_nid to struct lnet_nid

LU-10391 lnet: change lr_nid to struct lnet_nid

The nid in 'struct lnet_route' is now a struct lnet_nid'.

Test-Parameters: trivial
Test-Parameters: serverversion=2.12 serverdistro=el7.9 testlist=runtests
Test-Parameters: clientversion=2.12 testlist=runtests
Signed-off-by: Mr NeilBrown <neilb@suse.de>
Change-Id: I2e2f2e9c8d2cbdbc87b408ee4589952f2df02880
Reviewed-on: https://review.whamcloud.com/43593
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: James Simmons <jsimmons@infradead.org>
Reviewed-by: Chris Horn <chris.horn@hpe.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>