LU-18803 class: add namelen_max and maxbytes params

LU-18803 class: add namelen_max and maxbytes params

Add parameters for all OSD/OBD devices to print the statfs
os_namelen and os_maxbytes values from the respective devices.
This allows checking these values more easily from test scripts.

Update test_79 to print the values (for functionality) and test
that the llite.*.namelen_max matches the value of sbi->ll_statfs.

Signed-off-by: Andreas Dilger <adilger@whamcloud.com>
Change-Id: I613b364e62f729c033a0ece29e18507caa869122
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/58397
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Timothy Day <timday@amazon.com>
Reviewed-by: Arshad Hussain <arshad.hussain@aeoncomputing.com>
Reviewed-by: James Simmons <jsimmons@infradead.org>
Reviewed-by: Oleg Drokin <green@whamcloud.com>