manila unit tests are broken with newest mock library release

[Valeriy Ponomaryov]

See logs: http://logs.openstack.org/29/199929/5/check/gate-manila-python27/7960102/testr_results.html.gz

With release of mock 1.1.0 some our tests became broken.

Need to fix such broken tests.

[Valeriy Ponomaryov (vponomaryov)]

Setting importance as "critical" because it is blocker to merging process.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/200437

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/200437
Committed: https://git.openstack.org/cgit/openstack/manila/commit/?id=6abb30299b69a2d07af07a20c554210663edfd14
Submitter: Jenkins
Branch: master

commit 6abb30299b69a2d07af07a20c554210663edfd14
Author: Valeriy Ponomaryov <email address hidden>
Date: Fri Jul 10 12:27:16 2015 +0300

    Fix unit tests for compatibility with new mock==1.1.0

    After release of mock==1.1.0 lib some our tests became incompatible.
    Newest 'mock' lib does not have silent errors anymore and now our such errors
    are discovered. So, fix them.

    Change-Id: Ibb0e03f3b86e25201b7a888560ff133ebc627722
    Closes-Bug: #1473350