provider networks: plugins should specify supported network types

[Salvatore Orlando]

We have had for a long time this TODO in extension/providernet.py

# TODO(salvatore-orlando): Devise a solution for allowing plugins
# to alter the set of allowed values

As a result, we already have a plugin-specific network-type in this module, and more might come in the future.
It is probably worth addressing this in the current release, as the change will just require the extension to check if the plugin has supported network types and extend the resource attribute map accordingly, with the new validation data.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/22928

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/22928
Committed: http://github.com/openstack/quantum/commit/c2653d519ddeb5dc85fb6e7d11f8983c3d850dfa
Submitter: Jenkins
Branch: master

commit c2653d519ddeb5dc85fb6e7d11f8983c3d850dfa
Author: Salvatore Orlando <email address hidden>
Date: Mon Feb 25 11:37:34 2013 +0100

    Remove network type validation from provider networks extension

    Bug 1133064

    As the set of valid network types for the provider networks extension
    depends on the particular plugin, validation should be performed there.

    Change-Id: I3ce5762458bc553625a458ace80072bd804e31f0