LU-16166 ptlrpc: lower the message level in no resend case

LU-16166 ptlrpc: lower the message level in no resend case

Don't report the wrong generation as a error message in
rq_no_resend case.

Signed-off-by: Yang Sheng <ys@whamcloud.com>
Change-Id: I534cadc916fcd1eb6840439b6507e646d0e5d974
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/48585
Reviewed-by: Emoly Liu <emoly@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>