LU-10391 lnet: change tp_nid to 16byte in lnet_test_peer.

LU-10391 lnet: change tp_nid to 16byte in lnet_test_peer.

This updates 'struct lnet_test_peer' to store a large address 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: Id2f97a841bb0738503b0e87e7a9e2f8bebc4c3ec
Reviewed-on: https://review.whamcloud.com/43595
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: Amir Shehata <ashehata@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>