LU-10391 lnet: change LNetGet to take 16byte nid and pid.

LU-10391 lnet: change LNetGet to take 16byte nid and pid.

"self" is now passed to LNetGet as a pointer to a 16-byte-addr nid, or
NULL for "ANY".  "target" is passed as a 16-bytes-addr process_id.

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: I8e0fcd442d5195991b799a8db3ec8030c81f9400
Reviewed-on: https://review.whamcloud.com/43620
Reviewed-by: James Simmons <jsimmons@infradead.org>
Reviewed-by: Chris Horn <chris.horn@hpe.com>
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>