Admin mgmt API requires rate limiting for POSTs

[Dan Nguyen]

As we are looking to allow the admin API to send upgrade notification requests to guest agents there will be a need to throttle or rate limit request so we don't flood the system.

This would only require extending the rate limits feature to match the */mgmt/* URL's with a set of rules for each supported HTTP method.

The number of requests can be abstracted to a config file in the same way that the non-admin API rate limits are set.

[Dan Nguyen (daniel-a-nguyen)]

https://wiki.openstack.org/wiki/Trove-Guest-Agent-Upgrades#Throttling_Upgrade_Notifications

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/81557

[Openstack Gerrit (openstack-gerrit)]

Reviewed: https://review.openstack.org/81557
Committed: https://git.openstack.org/cgit/openstack/trove/commit/?id=d07c8c0445dca42ef5a27bbf945b9f99a4995aab
Submitter: Jenkins
Branch: master

commit d07c8c0445dca42ef5a27bbf945b9f99a4995aab
Author: daniel-a-nguyen <email address hidden>
Date: Wed Mar 19 08:30:47 2014 -0700

    Added separate rate limit setting for mgmt POST

    Created a simple unittest
    Fixed typo granced --> granted
    Fixed test to show that the 4th request will result in a delay

    Change-Id: I95062a805aaae88432c081d5f1d0a2da81d7108c
    Closes-Bug: #1294421