lava_wait_jobs.py: Log single line per artifact fetch for jobs

Instead of 2. Previously, we had frequent issues while fetching artifacts
from LAVA, so logging at the beginning/end of each fetch made sense. Now
as it's more stable, let's make logs cleaner.

Signed-off-by: Paul Sokolovsky <paul.sokolovsky@linaro.org>
Change-Id: I9011d610d7abc065d54ce56a916a2a4a66a2c137
1 file changed