Use reno for release notes

The OpenStack Release team has created a great release notes management
tool that integrates with Sphinx. Start using it. For reference on how
to use it, see http://docs.openstack.org/developer/reno/

Change-Id: I8153ec7861b508297a28a1916771776dee2deafe

doc/source/conf.py

@@ -23,7 +23,8 @@ sys.path.insert(0, os.path.abspath('../..'))
 extensions = [
     'sphinx.ext.autodoc',
     #'sphinx.ext.intersphinx',
-    'oslosphinx'
+    'oslosphinx',
+    'reno.sphinxext'
 ]
 
 # autodoc generation is a bit aggressive and a nuisance when doing heavy

doc/source/index.rst

@@ -7,6 +7,7 @@
    contributing
    installation
    api-reference
+   releasenotes
 
 Indices and tables
 ==================

doc/source/releasenotes.rst

@@ -0,0 +1,5 @@
+=============
+Release Notes
+=============
+
+.. release-notes::

releasenotes/notes/started-using-reno-242e2b0cd27f9480.yaml

@@ -0,0 +1,3 @@
+---
+other:
+- Started using reno for release notes.

test-requirements.txt

@@ -16,6 +16,7 @@ python-subunit>=0.0.18
 sphinx>=1.1.2,!=1.2.0,!=1.3b1,<1.3
 oslosphinx>=2.5.0,<2.6.0  # Apache-2.0
 oslotest>=1.5.1,<1.6.0  # Apache-2.0
+reno>=0.1.1  # Apache2
 testrepository>=0.0.18
 testscenarios>=0.4
 testtools>=0.9.36,!=1.2.0