Admin API os-instance_usage_audit_log is being tests as non-admin

[Ghanshyam Mann]

Nova V2 API 'os-instance_usage_audit_log' is for admin only and Nova policy.json has rule for the same But in unit test (test_instance_usage_audit_log) test this as non admin API by overriding policy as non-admin in fake_policy.py.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/132135

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/132135
Committed: https://git.openstack.org/cgit/openstack/nova/commit/?id=a72fe3f67266f4100bd4086ab0cbc481b14fc37e
Submitter: Jenkins
Branch: master

commit a72fe3f67266f4100bd4086ab0cbc481b14fc37e
Author: ghanshyam <email address hidden>
Date: Fri Oct 31 09:05:09 2014 +0900

    Fix instance_usage_audit_log test to use admin context

    Nova V2 API 'os-instance_usage_audit_log' is for admin only
    and Nova policy.json has rule for the same But
    test_instance_usage_audit_log tests this API as non admin.

    This patch fix test_instance_usage_audit_log test to use admin
    context.

    Also adding some more tests to verify this API with non-admin context.

    Closes-Bug: #1387901

    Change-Id: I20a477786ef0f3e1132629c4a12af40524e2b09f