LU-17600 lnet: delete lbstats and lnetunload

LU-17600 lnet: delete lbstats and lnetunload

It's not likely that anyone still uses these scripts.

Test-Parameters: trivial
Signed-off-by: Timothy Day <timday@amazon.com>
Change-Id: I418bdf2a1428905d598fdffdf27dff80831350d0
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/54250
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Arshad Hussain <arshad.hussain@aeoncomputing.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>