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: I38e7c60ec602c33f74de237b6014b4ac13ee4985

etc/nova/api-paste.ini

@@ -85,7 +85,7 @@ noauth2 = request_id faultwrap sizelimit noauth_v3 osapi_compute_app_v3
 keystone = request_id faultwrap sizelimit authtoken keystonecontext osapi_compute_app_v3
 
 [filter:request_id]
-paste.filter_factory = oslo.middleware:RequestId.factory
+paste.filter_factory = oslo_middleware:RequestId.factory
 
 [filter:compute_req_id]
 paste.filter_factory = nova.api.compute_req_id:ComputeReqIdMiddleware.factory
@@ -106,7 +106,7 @@ paste.filter_factory = nova.api.openstack.auth:NoAuthMiddlewareV3.factory
 paste.filter_factory = nova.api.openstack.compute.limits:RateLimitingMiddleware.factory
 
 [filter:sizelimit]
-paste.filter_factory = oslo.middleware:RequestBodySizeLimiter.factory
+paste.filter_factory = oslo_middleware:RequestBodySizeLimiter.factory
 
 [app:osapi_compute_app_v2]
 paste.app_factory = nova.api.openstack.compute:APIRouter.factory