Sync fixtures from oslo and use LockFixture

This commit adds fixture to openstack-common.conf to sync fixtures
from oslo. This patch also updates the location from which
LockFixture is used. It was originally in
tempest.openstack.common.lockutils but it was moved to the fixture
module.

Change-Id: Icffa613b92e059926b5394e9881ae0d8fe7fa910
7 files changed