Glance benchmarks fails by timeout on scale lab

Steps to reproduce:
Run glance benchmarks in rally

Actual result
stderr-0046: {{{
<class 'rally.exceptions.TimeoutException'>
Timeout exceeded.
Traceback (most recent call last):
  File "/opt/stack/.venv/lib/python2.7/site-packages/rally/benchmark/runners/base.py", line 73, in _run_scenario_once
    method_name)(**kwargs) or scenario_output
  File "/opt/stack/.venv/lib/python2.7/site-packages/rally/benchmark/scenarios/glance/images.py", line 97, in create_image_and_boot_instances
    **kwargs)
  File "/opt/stack/.venv/lib/python2.7/site-packages/rally/benchmark/scenarios/base.py", line 255, in func_atomic_actions
    f = func(self, *args, **kwargs)
  File "/opt/stack/.venv/lib/python2.7/site-packages/rally/benchmark/scenarios/glance/utils.py", line 99, in _create_image
    check_interval=CONF.benchmark.
  File "/opt/stack/.venv/lib/python2.7/site-packages/rally/benchmark/utils.py", line 121, in wait_for
    raise exceptions.TimeoutException()
TimeoutException: Timeout exceeded.
}}}