Remove last vestiges of oslo-incubator

This is a community goal for Ocata.  We're already not using any of
the code, but there are some other files and references left over.

Partial-Bug: #1639103

Change-Id: I2afd263ddc480e2512e3be77a03ffe5ae16e17a5

.pylintrc

@@ -102,7 +102,7 @@ ignore-iface-methods=
 [IMPORTS]
 # Deprecated modules which should not be used, separated by a comma
 deprecated-modules=
-# should use openstack.common.jsonutils
+# should use oslo_serialization.jsonutils
  json
 
 [TYPECHECK]

doc/source/devref/neutron_api.rst

@@ -34,14 +34,6 @@ that is explicitly marked to be consumed by other projects.
 
 That said, there are modules that other projects should definitely avoid relying on.
 
-Specifically, no external repository should use anything located under
-neutron.openstack.common.* import path. This code belongs to oslo-incubator
-modules and is not meant to work for consumers other than neutron main tree
-itself. (The only exception is made for advanced service repositories that are
-tightly controlled by neutron community.) Long story short, if your repository
-uses those modules, please switch to corresponding oslo libraries or use your
-own copy of oslo-incubator files.
-
 
 Breakages
 ---------

neutron/common/cache_utils.py

@@ -57,9 +57,6 @@ def _get_cache_region_for_legacy(url):
 
     if backend == 'memory':
         query = parsed.query
-        # NOTE(fangzhen): The following NOTE and code is from legacy
-        # oslo-incubator cache module. Previously reside in neutron at
-        # neutron/openstack/common/cache/cache.py:78
         # NOTE(flaper87): We need the following hack
         # for python versions < 2.7.5. Previous versions
         # of python parsed query params just for 'known'