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: If927fc7d70c625faa072dc8905a7e044f08aad33

designate/backend/agent_backend/impl_denominator.py

@@ -18,8 +18,8 @@ import itertools
 import dns.rdata
 import dns.rdatatype
 import dns.rdataclass
-from oslo.config import cfg
-from oslo.concurrency import lockutils
+from oslo_config import cfg
+from oslo_concurrency import lockutils
 from oslo_log import log as logging
 
 from designate.backend.agent_backend import base

setup.cfg

@@ -38,7 +38,7 @@ data_files =
 
 [entry_points]
 console_scripts =
-    designate-rootwrap = oslo.rootwrap.cmd:main
+    designate-rootwrap = oslo_rootwrap.cmd:main
     designate-api = designate.cmd.api:main
     designate-central = designate.cmd.central:main
     designate-manage = designate.cmd.manage:main