Add note for Django 1.8-1.10 support in relnote and doc

As we discussed in the team meeting, we plan to drop Django 1.8
to 1.10 support in Rocky. It is worth mentioned in the release note
and the document.

Change-Id: I11a4f4ec1d2a237fad7c58951ff23affd0b5708d

doc/source/install/from-source.rst

@@ -6,27 +6,7 @@ This page covers the basic installation of horizon in a production
 environment. If you are looking for a developer environment, see
 :ref:`quickstart`.
 
-.. _system-requirements-label:
-
-System Requirements
-===================
-
-* Python 2.7
-* Django 1.8
-* An accessible `keystone <https://docs.openstack.org/keystone/latest/>`_ endpoint
-
-* All other services are optional.
-  Horizon supports the following services as of the Pike release.
-  If the keystone endpoint for a service is configured,
-  horizon detects it and enables its support automatically.
-
-  * `cinder <https://docs.openstack.org/cinder/latest/>`_: Block Storage
-  * `glance <https://docs.openstack.org/glance/latest/>`_: Image Management
-  * `neutron <https://docs.openstack.org/neutron/latest/>`_: Networking
-  * `nova <https://docs.openstack.org/nova/latest/>`_: Compute
-  * `swift <https://docs.openstack.org/swift/latest/>`_: Object Storage
-  * Horizon also supports many other OpenStack services via plugins. For more
-    information, see the :ref:`install-plugin-registry`.
+For the system dependencies, see :doc:`system-requirements`.
 
 Installation
 ============

doc/source/install/index.rst

@@ -16,6 +16,14 @@ in environments with stand-alone services such as Object Storage.
    of the Identity service using the Apache HTTP server and Memcached
    service.
 
+System Requirements
+===================
+
+.. toctree::
+   :maxdepth: 1
+
+   system-requirements
+
 Installing from Packages
 ========================
 
@@ -31,7 +39,7 @@ Installing from Source
 ======================
 
 .. toctree::
-   :maxdepth: 1
+   :maxdepth: 2
 
    from-source.rst
 

doc/source/install/system-requirements.rst

@@ -0,0 +1,26 @@
+===================
+System Requirements
+===================
+
+The Queens release of horizon has the following dependencies.
+
+* Python 2.7
+* Django 1.11
+
+  * Django 1.8 to 1.10 are also supported.
+    Their support will be dropped in the Rocky release.
+
+* An accessible `keystone <https://docs.openstack.org/keystone/latest/>`_ endpoint
+
+* All other services are optional.
+  Horizon supports the following services as of the Queens release.
+  If the keystone endpoint for a service is configured,
+  horizon detects it and enables its support automatically.
+
+  * `cinder <https://docs.openstack.org/cinder/latest/>`_: Block Storage
+  * `glance <https://docs.openstack.org/glance/latest/>`_: Image Management
+  * `neutron <https://docs.openstack.org/neutron/latest/>`_: Networking
+  * `nova <https://docs.openstack.org/nova/latest/>`_: Compute
+  * `swift <https://docs.openstack.org/swift/latest/>`_: Object Storage
+  * Horizon also supports many other OpenStack services via plugins. For more
+    information, see the :ref:`install-plugin-registry`.

releasenotes/notes/django-version-queens-b7785b96ecbceaf0.yaml

@@ -0,0 +1,5 @@
+---
+other:
+  - |
+    The Queens release of horizon depends on Django 1.8 to 1.11, but
+    Django 1.8 to 1.10 support will be dropped in the next release (Rocky).