Add DevStack base installation section

Change-Id: Idcc4c70e9b897b2f319b50b555297ae10c6afb39

doc/source/index.rst

@@ -9,7 +9,7 @@ Welcome to kuryr-kubernetes's documentation!
 Contents:
 
 .. toctree::
-   :maxdepth: 2
+   :maxdepth: 3
 
    readme
    installation/index

doc/source/installation/devstack/index.rst

@@ -0,0 +1,34 @@
+..
+      Licensed under the Apache License, Version 2.0 (the "License"); you may
+      not use this file except in compliance with the License. You may obtain
+      a copy of the License at
+
+          http://www.apache.org/licenses/LICENSE-2.0
+
+      Unless required by applicable law or agreed to in writing, software
+      distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+      WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+      License for the specific language governing permissions and limitations
+      under the License.
+
+      Convention for heading levels in Neutron devref:
+      =======  Heading 0 (reserved for the title in a document)
+      -------  Heading 1
+      ~~~~~~~  Heading 2
+      +++++++  Heading 3
+      '''''''  Heading 4
+      (Avoid deeper levels because they do not render well.)
+
+
+DevStack based Installation
+===========================
+
+This section describes how you can install and configure kuryr-kubernetes with
+DevStack for testing different functionality, such as nested or different
+ML2 drivers.
+
+.. toctree::
+    :maxdepth: 1
+
+    nested-vlan
+    nested-macvlan

doc/source/installation/index.rst

@@ -29,9 +29,8 @@ This section describes how you can install and configure kuryr-kubernetes
     :maxdepth: 2
 
     manual
-    nested-vlan
-    nested-macvlan
     https_kubernetes
     ports-pool
     services
     ipv6
+    devstack/index