Allow fine grained control on cells actions

[Sulochan Acharya]

Operators will often have a need to fine grain control over what actions are allowed on an extension. For cells, potentially destructive (as in when done mistakenly) actions should have better access/policy control.

The following actions therefore should get better policy control on cells extensions.

-Create
-Delete
-Update

[Christopher Yeoh (cyeoh-0)]

This should just form part of this nova spec

https://review.openstack.org/#/c/92326/

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/104688

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/104688
Committed: https://git.openstack.org/cgit/openstack/nova/commit/?id=8b6ac08b0816c96ba7f2a40fb85413f58ae8faf7
Submitter: Jenkins
Branch: master

commit 8b6ac08b0816c96ba7f2a40fb85413f58ae8faf7
Author: Sulochan Acharya <email address hidden>
Date: Thu Jul 3 21:03:53 2014 +0000

    Adds more policy control to cells ext

    Allow create,delete,update and sync_instances to
    have fine grained policy control.

    UpgradeImpact
    DocImpact

    Change-Id: I2e32ae2f37d3b599585d25535c79eecf6485b462
    Closes-Bug: 1335901