qa/tasks/radosbench: increase timeout

The current timeout isn't enough in some cases (powercycle thrashing leaves
osds down for a long time because rebooting is so slow).

Signed-off-by: Sage Weil <sage@redhat.com>
(cherry picked from commit dfa95db)

qa/tasks/radosbench.py

@@ -96,7 +96,7 @@ def task(ctx, config):
     try:
         yield
     finally:
-        timeout = config.get('time', 360) * 5 + 180
+        timeout = config.get('time', 360) * 10 + 180
         log.info('joining radosbench (timing out after %ss)', timeout)
         run.wait(radosbench.itervalues(), timeout=timeout)