LU-12678 lnet: discard WIRE_ATTR

LU-12678 lnet: discard WIRE_ATTR

This macro adds nothing of value, and make the code harder to
read for new readers so it was remove for the Linux client.
We still want to keep track of what data structures are
transmitted over the wire and ensure the protocol does not get
broken. Move the wire protocol structures to their own header
files and add wire checking.

Linux-commit: 3e60455d1953fcee6042c107a8d5657886aa9c58

Test-Parameters: trivial
Change-Id: I4867e80bf8e8f0598d1920865d6f1b9ba920ce5b
Signed-off-by: Mr NeilBrown <neilb@suse.de>
Signed-off-by: James Simmons <jsimmons@infradead.org>
Reviewed-on: https://review.whamcloud.com/37914
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>