Drop use of 'oslo' namespace package

The Oslo libraries have moved all of their code out of the 'oslo'
namespace package into per-library packages. The namespace package was
retained during kilo for backwards compatibility, but will be removed by
the liberty-2 milestone. This change removes the use of the namespace
package, replacing it with the new package names.

The patches in the libraries will be put on hold until application
patches have landed, or L2, whichever comes first. At that point, new
versions of the libraries without namespace packages will be released as
a major version update.

Please merge this patch, or an equivalent, before L2 to avoid problems
with those library releases.

Blueprint: remove-namespace-packages
https://blueprints.launchpad.net/oslo-incubator/+spec/remove-namespace-packages

Change-Id: Ie11a5d51a6471792e122942dfc9063a0d9d38399

barbicanclient/tests/test_secrets.py

@@ -15,7 +15,7 @@
 import base64
 import json
 
-from oslo.utils import timeutils
+from oslo_utils import timeutils
 
 from barbicanclient.tests import test_client
 from barbicanclient import secrets, base