lava_wait_jobs.py: Fetch artifacts for finished jobs immediately

Intention is to parallelize waiting for job completion and fetching
artifacts, i.e. as soon as a complete job is detected, fetch artifacts
for it, instead of spending time waiting for other jobs to complete
first.

Signed-off-by: Paul Sokolovsky <paul.sokolovsky@linaro.org>
Change-Id: I7bbfb31516ad53fe119f1775b5d795ffd07378bc
2 files changed