add lava-v2-callback.py to parse LAVA v2 callback data
add lava-v2-callback.py to parse LAVA v2 callback data

Add lava-v2-callback.py to parse the JSON data sent in LAVA v2
callback.  This is to be used primarily with automated bisection to
determine whether a LAVA job passed or failed.

This is intended to replace lava-v2-get-boot-results.py to stop
polling the backend for boot results and stop cluttering the database
with single boot results from bisection jobs.

Signed-off-by: Guillaume Tucker <e7e20b7c30f19d4ca6b81319ef81bf200369d137@collabora.com>

kernelci/lava-ci-staging,kernelci/lava-ci-staging,kernelci/lava-ci-staging