LU-6142 contrib: git plugins

LU-6142 contrib: git plugins

Git plugins to quick see the progress towards
checkpatch cleanups in Lustre.

The original (git-tabcheck) was authored by
Andreas Dilger to help with space to tabs conversion.
The second (git-checkpatch) was modified from
the original script to help capture generic
checkpatch warnings.

Signed-off-by: Timothy Day <timday@amazon.com>
Change-Id: Iab7aaa70690d00f1b7dd5ebcd2412865dae34729
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/54101
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>