scripts: tests: Blackbox test expansion - footprint

Adds tests related to report flags:
*     --compare-report
* -m, --last-metrics
* -D, --all-deltas
*     --footprint-threshold
*     --show-footprint
*     --footprint-from-buildlog

Signed-off-by: Lukasz Mrugala <lukaszx.mrugala@intel.com>