LU-10391 ptlrpc: change rq_peer to struct lnet_nid

LU-10391 ptlrpc: change rq_peer to struct lnet_nid

rq_peer in struct ptlrpc_request can now store large NIDs.
ptlrpc_connection_get() and others now take a
struct lnet_processid

Signed-off-by: Mr NeilBrown <neilb@suse.de>
Change-Id: I3bb419720434714301946d278413ce6090aa2cdd
Reviewed-on: https://review.whamcloud.com/44638
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Frank Sehr <fsehr@whamcloud.com>
Reviewed-by: James Simmons <jsimmons@infradead.org>
Reviewed-by: Chris Horn <chris.horn@hpe.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>