Hardcoded paths prevent tests from being parallelized

Fix proposed to branch: master
Review: https://review.openstack.org/65870

Reviewed: https://review.openstack.org/65870
Committed: https://git.openstack.org/cgit/openstack/keystone/commit/?id=be995bcf80eb946e584922155302e38e59112255
Submitter: Jenkins
Branch: master

commit be995bcf80eb946e584922155302e38e59112255
Author: Morgan Fainberg <email address hidden>
Date: Wed Mar 19 15:42:55 2014 -0700

    Add support for parallel testr workers in Keystone

    Full support for parallel testr workers now works in keystone. The
    major item to be aware of is that if non-SQLite backends or a LIVE
    LDAP backend is being used for testing, the concurrency must be set
    to 1 to avoid conflicts. To artificially set the concurrency set
    the env variable ``TEST_RUN_CONCURRENCY`` to the desired number of
    testr workers. The default is to run one worker. To use 1 per
    available core, set ``TEST_RUN_CONCURRENCY`` to 0.

    Each worker uses a subdirectory of the test temp dir based upon
    the PID. When the worker exists (via the use of atexit), the
    worker-specific PID directory is automatically removed.

    The first time concurrent tests are run in a given environment,
    ensure that old .testrepository directories are cleaned up as they
    may introduce bad learning data on how to bin the tests based upon
    test runs that occured without concurrency.

    Closes-Bug: #1240052
    Change-Id: I5c3385a431774ce574266a82065ed6237e8b3665