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
diff --git a/lava_helper/lava_wait_jobs.py b/lava_helper/lava_wait_jobs.py
index 37ea4d2..ec1191a 100755
--- a/lava_helper/lava_wait_jobs.py
+++ b/lava_helper/lava_wait_jobs.py
@@ -95,7 +95,6 @@
     for job_id, info in jobs.items():
         job_dir = info['job_dir']
         t = time.time()
-        _log.info("Fetching artifacts for job %d to %s", job_id, job_dir)
 
         retry_delay = 3
         for retry in range(3, 0, -1):
@@ -118,11 +117,11 @@
                 if retry == 1:
                     raise
                 else:
-                    _log.warning("fetch_artifacts: Error %r occurred, retrying", e)
+                    _log.warning("fetch_artifacts(%s): Error %r occurred, retrying", job_id, e)
                     time.sleep(retry_delay)
                     retry_delay *= 2
 
-        _log.info("Fetched artifacts in %ds", time.time() - t)
+        _log.info("Fetched artifacts for job %s in %ds", job_id, time.time() - t)
         codecov_helper.extract_trace_data(target_log, job_dir)
     return(jobs)