update nova config section of quantum admin guide for grizzly

[dan wendlandt]

include:

- security group proxy setting
- metadata setting
- NoopFWDriver

[dan wendlandt (danwent)]

Also cover the fact that several plugins no longer need vif-plugging config if they support port-bindings extension.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/24758

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/24758
Committed: http://github.com/openstack/openstack-manuals/commit/f7560e2d8043f1bc114144c2dbbdd69ac113bd60
Submitter: Jenkins
Branch: master

commit f7560e2d8043f1bc114144c2dbbdd69ac113bd60
Author: Dan Wendlandt <email address hidden>
Date: Tue Mar 19 00:16:12 2013 -0700

    q-admin: update keystone + nova config section

    bug 1156822

    - added sections for new metadata & security groups flags
    - updated vif-plugging section in light of port-bindings
    - also cleaned up some incorrect references to 'OpenStack
    Compute' where it should be 'OpenStack Identity'.
    - other misc improvements as I saw them.

    Change-Id: I47aec95aa961d362375d7c3f54ce32a9fbc29fce