LU-15367 llite: add 'rc' to all iotrace messages

LU-15367 llite: add 'rc' to all iotrace messages

It's easy to add the return code to iotrace, so let's do it.

Test-Parameters: trivial
Signed-off-by: Patrick Farrell <paf0187@gmail.com>
Change-Id: Ic2357d3d32fd4954e96878174f13b7fe907df2df
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/52007
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Sebastien Buisson <sbuisson@ddn.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>