Properly use _ in tests

[Tim Hinrichs]

We noticed in congress/tests/test_congress.py that there are many instances where there is a function returns multiple values, and we do not properly use an underscore for the ones that are unused.

In test_policy_execute_no_args(), we see...

        (id3, rule3) = self.api['rule'].add_item(
            {'rule': 'q(2)'}, {}, context={'policy_id': 'alice'})

and then never use 'rule3'. It would be easier to understand this code if it were written...

        (id3, _) = self.api['rule'].add_item(
            {'rule': 'q(2)'}, {}, context={'policy_id': 'alice'})

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/175721

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/175721
Committed: https://git.openstack.org/cgit/openstack/congress/commit/?id=973736067f4a28ec535f8425e69c43839d0fe2e5
Submitter: Jenkins
Branch: master

commit 973736067f4a28ec535f8425e69c43839d0fe2e5
Author: Amey Bhide <email address hidden>
Date: Mon Apr 20 22:46:14 2015 -0700

    Fix tests to use _ for unused varible

    Closes-Bug: #1446411
    Change-Id: Ia9796bfa87f3273f615baeabcc50cc87914fb7d0