Comment 4 for bug 1636157

Reviewed: https://review.openstack.org/391113
Committed: https://git.openstack.org/cgit/openstack/nova/commit/?id=4a09c2210b3c07343411a06c676c2d85aa0e214f
Submitter: Jenkins
Branch: master

commit 4a09c2210b3c07343411a06c676c2d85aa0e214f
Author: Prashanth kumar reddy <email address hidden>
Date: Thu Oct 27 07:09:01 2016 -0400

    Separate CRUD policy for server_groups

    The same policy rule (os_compute_api:os-server-groups) is being used
    for all actions (show, index, delete, create) for server_groups REST
    APIs. It is thus impossible to provide different RBAC for specific
    actions based on roles. To address this changes are made to have
    separate policy rules for each of action.

    It has been argued that index and show may not need separate policy
    rules, but most other places in nova (and OpenStack in general) do
    have separate policy rules for each action. This affords the ultimate
    flexibility to deployers, who can obviously use the same rule if
    that is what they want. One example where show and index may be
    different is that if show is restricted based on some criteria, such
    that a user is able to see some resources within the tenant but not
    others, then list would need to be disallowed to prevent the user
    from using list to see resources they cannot show.

    Change-Id: Ica9e07f6e80257902b4a0cc44b65fd6bad008bba
    Closes-Bug: #1636157