lava_wait_jobs: Use format to avoid specifying type

The print for timeout expiring is using the
wrong format specifier. Just use the format
method on strings when printing to avoid
specifying at all.

Signed-off-by: Antonio de Angelis <antonio.deangelis@arm.com>
Change-Id: Ida8e5a625fd764afe0f1bfdee6c11cbefa340e51
diff --git a/lava_helper/lava_wait_jobs.py b/lava_helper/lava_wait_jobs.py
index 12862c5..dc49360 100755
--- a/lava_helper/lava_wait_jobs.py
+++ b/lava_helper/lava_wait_jobs.py
@@ -67,7 +67,7 @@
     finished_jobs = lava.block_wait_for_jobs(job_list, user_args.dispatch_timeout, 5, callback=inline_fetch_artifacts)
     unfinished_jobs = [item for item in job_list if item not in finished_jobs]
     for job in unfinished_jobs:
-        _log.info("Cancelling unfinished job %d because of timeout.", job)
+        _log.info("Cancelling unfinished job {} because of timeout.".format(job))
         lava.cancel_job(job)
     if len(unfinished_jobs) > 0:
         _log.info("Job fails because some test jobs have been cancelled.")