Move oslo.utils to oslo_utils namespace

This is the fourth in a series of changes to move to using
the new oslo_<library> namespace that is being used for
oslo libraries.

There is currently a shim in place that is allowing the old
oslo.<library> imports to work, but we need to be prepared for
when the shims go away.  Thus, we need patches like this one to
move to the new namespace.

This patch also updates our hacking check to ensure that no instances
of oslo.utils sneak back in.

Change-Id: I19c331a9b54c5f42c278577ecc59fe1b65e61af0

cinder/db/sqlalchemy/api.py

@@ -26,11 +26,11 @@ import time
 import uuid
 import warnings
 
-from oslo.utils import timeutils
 from oslo_config import cfg
 from oslo_db import exception as db_exc
 from oslo_db import options
 from oslo_db.sqlalchemy import session as db_session
+from oslo_utils import timeutils
 import osprofiler.sqlalchemy
 import six
 import sqlalchemy