Remove use of graduated modules

- Replace usage of oslo_policy.openstack.common.log with oslo_log.log
- Replace usage of oslo_policy.openstack.common.fixture.lockutils with
  oslo_concurrency.fixture.lockutils
- Replace tox usage of oslo_policy.openstack.common.lockutils with
  lockutils-wrapper console script provided by oslo_concurrency

Closes-bug: 1415628

Change-Id: I6c18351b5bafa50a4da090b270f576a549db6b93

openstack-common.conf

@@ -2,7 +2,7 @@
 
 # The list of modules to copy from oslo-incubator.git
 script = tools/run_cross_tests.sh
-modules=fileutils,fixture.lockutils,lockutils,log
+modules=fileutils
 
 # The base module to hold the copy of openstack.common
 base=oslo_policy