The v2 task module is not fully covered with tests

[Kamil Rykowski]

The v2 task module is missing some important unittests which can lead in the future to regression. Most of them are about listing tasks using marker & sorting keys.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/165436

[Kamil Rykowski (kamil-rykowski)]

During preparing new test cases I've found a bug in v2/tasks.py which fails for python 3.4. I've included the fix in the proposed patch.

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/165436
Committed: https://git.openstack.org/cgit/openstack/python-glanceclient/commit/?id=d9d586942bf3f78ba174eb5832f60d80a7c839ca
Submitter: Jenkins
Branch: master

commit d9d586942bf3f78ba174eb5832f60d80a7c839ca
Author: Kamil Rykowski <email address hidden>
Date: Wed Mar 18 15:45:08 2015 +0100

    Extend unittests coverage for v2 tasks module

    Add new tests for v2 tasks module to cover following cases:
    - getting list of tasks using the marker
    - getting list of tasks using sort_key & sort_dir keys

    Change-Id: Ic126999ebb16e51cc472fe8f86dfe1fced0bc016
    Closes-Bug: 1433637