fixture module from oslo-incubator should be dropped

[Ihar Hrachyshka]

Now that we're able to migrate to oslo.concurrency, the only remaining usage of any fixture from incubator is for config one, which is also available from oslo.config itself. So we're open to drop yet another unused module from neutron tree.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/140284

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/140284
Committed: https://git.openstack.org/cgit/openstack/neutron/commit/?id=53c7d82c681344d21ebfd64433b8f682ed70c4e5
Submitter: Jenkins
Branch: master

commit 53c7d82c681344d21ebfd64433b8f682ed70c4e5
Author: Ihar Hrachyshka <email address hidden>
Date: Fri Dec 5 22:41:02 2014 +0100

    Dropped fixture module

    The only single remaining usage of those fixtures in the tree was for
    oslo.config fixture, which is now available via oslo.config library
    itself.

    Change-Id: I997a3a086598a8addf093790db102cd130588d95
    Closes-Bug: #1399804