Chore: Centralise CSIT prepare/run scripts

Start migrating prepare-csit.sh and run-csit.sh to common location.
Currently these scripts have been duplicated and fixed versions are
not universally available, meaning some jobs are still failing.

Issue-ID: CIMAN-33
Signed-off-by: Matthew Watkins <mwatkins@linuxfoundation.org>
Change-Id: Iedd39bf310564686e5b6cb3bc4a6ac012a453f8c
2 files changed