gate-tempest-dsvm-tap-as-a-service failure due to tempest changes

[YAMAMOTO Takashi]

recent tempest-lib/tempest broke taas tempest plugin.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/287641

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/287641
Committed: https://git.openstack.org/cgit/openstack/tap-as-a-service/commit/?id=6f16de6f32ac3834640470267fc5d11627a25eea
Submitter: Jenkins
Branch: master

commit 6f16de6f32ac3834640470267fc5d11627a25eea
Author: YAMAMOTO Takashi <email address hidden>
Date: Thu Mar 3 17:06:21 2016 +0900

    Update tempest plugin after tempest-lib deprecation

    This is a combination of the following 2 commits.
    (I combined them to pass the gate job.)

    ------
    Update tempest plugin after tempest-lib deprecation

    Closes-Bug: #1552598
    Related: blueprint tempest-lib-reintegration
    ------
    TrivialFix: Move from tempest to tempest.lib

    As [1] has merged, to prevent future tempest gate failures,
    we can move tempest to tempest.lib for the Network Client.

    [1]: https://review.openstack.org/#/c/290108/
    ------

    Co-authored-by: reedip <email address hidden>
    Change-Id: I8b952811dd7ebfa24b269802f1f0c56362bbe12e