Update download_command to work with latest LAVA
LAVA version 2021.11 introduces a change in the way paths in compressed overlays are handled breaking Apertis tests.
Fix the issue by specifying the path to be use to extract the compressed overlay.
Additional information:
https://gitlab.collabora.com/lava/lava/-/commit/07048f042c65202eb75ac874cc93eabd2d96cd54
Signed-off-by: Walter Lozano walter.lozano@collabora.com