REST API relies on policies being initialized after RESOURCE_ATTRIBUTE_MAP is processed, does nothing to ensure it.

Video demonstrating how to reproduce http://youtu.be/-nL1gyL3KL8.

Can you please describe steps to reproduce in text form?
I think there was several attempts to fix the issue so I wonder if it really still exists.

Here, in general form, are the steps used to reproduce this issue as demonstrated in the video:

1. simulate high agent load by changing report_interval to 1
2. simulate startup processing load by putting a sleep immediately after the line containing:
        ext_mgr = extensions.PluginAwareExtensionManager.get_instance()
   in neutron/api/v2/router.py
3. stop agents
4. stop neutron server
5. start agents
6. start neutron server

run nova network-list until REST API starts responding. Networks with router:external=True that should be visible due to the neutron FieldCheck on the external network extension do not succeed. Consequence is these networks are hidden from the user.

Reviewed: https://review.openstack.org/127633
Committed: https://git.openstack.org/cgit/openstack/neutron/commit/?id=eeff5d06b2099ed9813091926dd8cef58680ad8f
Submitter: Jenkins
Branch: master

commit eeff5d06b2099ed9813091926dd8cef58680ad8f
Author: Brent Eagles <email address hidden>
Date: Fri Oct 10 13:27:51 2014 -0230

    Reset policies after RESOURCE_ATTRIBUTE_MAP is populated

    The REST API relies on neutron-specific policy checking logic that is
    only available after the extensions are loaded and the
    RESOURCE_ATTRIBUTE_MAP is populated. This patch resets the policies
    immediately after these steps are done. This ensures that in the event
    the policies are prematurely loaded for any reason, the on-demand
    loading of the policies will reload the policies and properly configure
    the neutron specific checks on the next policy check.

    Change-Id: Ic2ab3f0179b0c192e63af0bc4268d92aa26bdabe
    Closes-Bug: #1398566
    Related-Bug: #1254555

Fix proposed to branch: stable/juno
Review: https://review.openstack.org/146572

Fix proposed to branch: stable/icehouse
Review: https://review.openstack.org/146603

Reviewed: https://review.openstack.org/146572
Committed: https://git.openstack.org/cgit/openstack/neutron/commit/?id=175e86977d6905e1e11766ca47e30b89c88d8827
Submitter: Jenkins
Branch: stable/juno

commit 175e86977d6905e1e11766ca47e30b89c88d8827
Author: Brent Eagles <email address hidden>
Date: Fri Oct 10 13:27:51 2014 -0230

    Reset policies after RESOURCE_ATTRIBUTE_MAP is populated

    The REST API relies on neutron-specific policy checking logic that is
    only available after the extensions are loaded and the
    RESOURCE_ATTRIBUTE_MAP is populated. This patch resets the policies
    immediately after these steps are done. This ensures that in the event
    the policies are prematurely loaded for any reason, the on-demand
    loading of the policies will reload the policies and properly configure
    the neutron specific checks on the next policy check.

    Change-Id: Ic2ab3f0179b0c192e63af0bc4268d92aa26bdabe
    Closes-Bug: #1398566
    Related-Bug: #1254555
    (cherry picked from commit eeff5d06b2099ed9813091926dd8cef58680ad8f)

Reviewed: https://review.openstack.org/146603
Committed: https://git.openstack.org/cgit/openstack/neutron/commit/?id=c9cb001626e90239b1ffe5583ab9a4349280856c
Submitter: Jenkins
Branch: stable/icehouse

commit c9cb001626e90239b1ffe5583ab9a4349280856c
Author: Brent Eagles <email address hidden>
Date: Fri Oct 10 13:27:51 2014 -0230

    Reset policies after RESOURCE_ATTRIBUTE_MAP is populated

    The REST API relies on neutron-specific policy checking logic that is
    only available after the extensions are loaded and the
    RESOURCE_ATTRIBUTE_MAP is populated. This patch resets the policies
    immediately after these steps are done. This ensures that in the event
    the policies are prematurely loaded for any reason, the on-demand
    loading of the policies will reload the policies and properly configure
    the neutron specific checks on the next policy check.

    Change-Id: Ic2ab3f0179b0c192e63af0bc4268d92aa26bdabe
    Closes-Bug: #1398566
    Related-Bug: #1254555
    (cherry picked from commit eeff5d06b2099ed9813091926dd8cef58680ad8f)