prevent extraneous log messages and stdout prints

[Venkatesh Sampath]

When we run unit tests using './run_tests.sh glance.tests.unit', it prints quite a lot of unwanted log messages and stdout prints. This quite badly clutters the whole unit test result output making things difficult to see whats happening.

Attaching a sample out put of the unit tests.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/224787

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/224787
Committed: https://git.openstack.org/cgit/openstack/glance/commit/?id=367925c770c98b188894e289944bb01fe711a588
Submitter: Jenkins
Branch: master

commit 367925c770c98b188894e289944bb01fe711a588
Author: Venkatesh Sampath <email address hidden>
Date: Thu Sep 17 11:20:14 2015 +0530

    Prevent extraneous log messages and stdout prints

    while running unit tests using run_tests.sh,
    we can see quite an amount of unwanted log
    messages and stdout prints as part of
    the unit test results on the console.
    This basically makes it difficult to go
    through the test results and figure whats happening.

    This patch fixes the cause for those
    extraneous log messages caused due to
    a incorrect fixture usage in test_manage.py
    and also by mocking sys.stdout at the respective unit tests.

    Closes-bug: #1496898
    Change-Id: If986691cb3f36ba357a5c0df34b6df7bf2d8ff86