teuthology/run_tasks: do not call sys.exc_clear() for clearing exception
sys.exc_clear() was removed in Python3, see
so we should not
call it.
@@ -187,7 +187,6 @@ def run_tasks(tasks, ctx):
interactive.task(ctx=ctx, config=None)
else:
if suppress:
- sys.exc_clear()
exc_info = (None, None, None)
if exc_info != (None, None, None):
