Quota checks in test_extension_pnet not circumvented properly

[Salvatore Orlando]

We had reports that in some cases the just merged unit tests fail.
This is because the plugin is mocked, so at the end of the day get_networks_counts is a mock call, and it gets converted to int in the quota checks.

In some instance, it might return a negative value, leading the InvalidQuotaValue being raised.
The function's return value should be correctly patched.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/27738

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/27738
Committed: http://github.com/openstack/quantum/commit/aa6ba83c2046e35ccfdafa3641d17a3b26859cf7
Submitter: Jenkins
Branch: master

commit aa6ba83c2046e35ccfdafa3641d17a3b26859cf7
Author: Salvatore Orlando <email address hidden>
Date: Mon Apr 29 20:20:12 2013 +0200

    Stub out get_networks_count properly for pnet unit tests

    Bug 1174457

    Change-Id: I30a5c549d5d236124a7798a757601e970067b284