LU-10391 ptlrpc: pass lnet_nid for self to ptl_send_buf()

LU-10391 ptlrpc: pass lnet_nid for self to ptl_send_buf()

The 'self' arg to ptl_send_buf() is now a pointer to a
'struct lnet_nid', and can be NULL meaning "ANY NID".

LNetPut() already accepts NULL as the self pointer.

Signed-off-by: Mr NeilBrown <neilb@suse.de>
Change-Id: I859dfa10e2f5e50c029c6926fe25ac036fb4f494
Reviewed-on: https://review.whamcloud.com/44641
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>