LU-10391 lnet: convert LNetGetID to return an large-addr pid

LU-10391 lnet: convert LNetGetID to return an large-addr pid

LNetGetID now returns a 'struct processid' containing an
large-address nid.

Various places still convert it to a 4-byte-addr nid for use.

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: Id1dfcd33ad11609fc18fe6779dff39bc9f1ff03a
Reviewed-on: https://review.whamcloud.com/43607
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>