LU-14895 brw: log T10 GRD tags during checksum calcs

LU-14895 brw: log T10 GRD tags during checksum calcs

Log the T10 guard tags during checksum calculation on the client and
target to help identify where checksum errors are being introduced.
The added debugging is only active on RPC resend, so will not add
overhead during the normal IO path.

Signed-off-by: Andreas Dilger <adilger@whamcloud.com>
Change-Id: Ia4f14f2f2296da096acf629c74558386e7ce7057
Reviewed-on: https://review.whamcloud.com/44655
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Li Dongyang <dongyangli@ddn.com>
Reviewed-by: Alex Zhuravlev <bzzz@whamcloud.com>
Reviewed-by: Li Xi <lixi@ddn.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>