admin role judge exception caused the policy to fail

[zhangxiaohan]

Do the following:
1. source openrc admin admin
2. openstack multiregion networking pod create --region-name CentralRegion

Error response following:

{"code": 401, "description": "Unauthorized to create pods", "title": "Unauthorized"}

Log following:
2018-08-20 18:09:50.869 ERROR tricircle.common.policy req-8e0900a7-721a-4c40-af37-87167a2c5520 None None Policy doesn't allow this operation to be performed., admin_api:pods:create, {'project_id': None, 'user_id': None}: PolicyNotAuthorized: Policy doesn't allow this operation to be performed.
2018-08-20 18:09:50.869 TRACE tricircle.common.policy Traceback (most recent call last):
2018-08-20 18:09:50.869 TRACE tricircle.common.policy File "/opt/stack/tricircle/tricircle/common/policy.py", line 288, in enforce
2018-08-20 18:09:50.869 TRACE tricircle.common.policy do_raise=True, exc=exc, *args, **kwargs)
2018-08-20 18:09:50.869 TRACE tricircle.common.policy File "/usr/local/lib/python2.7/dist-packages/oslo_policy/policy.py", line 878, in enforce
2018-08-20 18:09:50.869 TRACE tricircle.common.policy raise exc(*args, **kwargs)
2018-08-20 18:09:50.869 TRACE tricircle.common.policy PolicyNotAuthorized: Policy doesn't allow this operation to be performed.

[baisen (song1)]

https://review.openstack.org/#/c/593987/