LU-9680 contrib: share libyaml C code generator

LU-9680 contrib: share libyaml C code generator

Writing proper libyaml C code is not easy. So I wrote an
application that generates the C code to help the developer not
struggle starting from scratch. It wouldn't be a one to one
copy and paste but it greatly helps. The build the application
just do gcc -lyaml yaml-event-dump.c

Test-Parameters: trivial
Change-Id: I1b570dbfc3ea2e6a7ec77b3743aa4cd80aba2acb
Signed-off-by: James Simmons <jsimmons@infradead.org>
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/51508
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Timothy Day <timday@amazon.com>
Reviewed-by: Alex Deiter <alex.deiter@gmail.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>