openstack-heat-api start fail,missing oslo_policy

[weiyu]

I start centos-rdo-heat-engine fail

345f5ae21708 kollaglue/centos-rdo-heat-engine:latest "/start.sh" 34 minutes ago Restarting (1) 7 minutes ago

[root@kolla-1 rdo]# docker logs 345f5ae21708

Traceback (most recent call last):
  File "/usr/bin/heat-manage", line 27, in <module>
    from heat.cmd import manage
  File "/usr/lib/python2.7/site-packages/heat/cmd/manage.py", line 25, in <module>
    from heat.common import context
  File "/usr/lib/python2.7/site-packages/heat/common/context.py", line 28, in <module>
    from heat.common import policy
  File "/usr/lib/python2.7/site-packages/heat/common/policy.py", line 21, in <module>
    from oslo_policy import policy
ImportError: No module named oslo_policy

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/189974