Clean authorization mocking in fuelclient tests

[Sebastian Kalinowski]

After https://github.com/stackforge/python-fuelclient/commit/9b0b6ab2f09ff75445550b7210104e21df5d8cd6 , due to 'requests' mocking, "Client" singleton and caching in it, results in sharing authorization state between tests which sometimes leads to strange results and errors in tests (especially when running just a subset of tests with ./run_tests.sh).

Mocking of authorization should be done like in 'execute_wo_auth' method in tests.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/172822

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/172822
Committed: https://git.openstack.org/cgit/stackforge/python-fuelclient/commit/?id=ff186de358cbda489a320723de47a9e61ae23364
Submitter: Jenkins
Branch: master

commit ff186de358cbda489a320723de47a9e61ae23364
Author: Sebastian Kalinowski <email address hidden>
Date: Mon Apr 13 09:30:10 2015 +0200

    Clean authorization mocking in tests

    Remove remaining 'execute_wo_tests' as now authorization is
    mocked in all tests by default.
    Changed mocking from 'auth_client' to 'auth_required' to make
    it simple to change in tests (now it's just a matter of changing
    boolean).

    Change-Id: Icfd0ef3058918e1578a21429f84a1583eddd3a8e
    Closes-Bug: #1443279