Deprecate the identity-feature-enabled.reseller config option.

All supported version of OpenStack now supports the 'reseller'
[1] feature. So let's deprecate the related feature flag.

[1]: http://specs.openstack.org/openstack/keystone-specs/specs/kilo/reseller.html

Change-Id: Ia86c6f351919bddf2611524bf0b143aa09dbddee
diff --git a/releasenotes/notes/deprecate-identity-feature-enabled.reseller-84800a8232fe217f.yaml b/releasenotes/notes/deprecate-identity-feature-enabled.reseller-84800a8232fe217f.yaml
new file mode 100644
index 0000000..c0a06d1
--- /dev/null
+++ b/releasenotes/notes/deprecate-identity-feature-enabled.reseller-84800a8232fe217f.yaml
@@ -0,0 +1,8 @@
+---
+upgrade:
+  - The default value for the ``reseller`` option in the
+    ``identity-feature-enabled`` section has been changed from ``False``
+    to ``True``.
+deprecations:
+  - The ``reseller`` option in the ``identity-feature-enabled`` section is now
+    deprecated.