releasenotes: add notes for Mitaka cycle

* Delete "use reno" note, since it's a new project.
* Explain what does the first release.

Change-Id: Ia7fa445afab37ac6d4cadc9e410cdaf919c1cd7b

releasenotes/notes/first_note-7f8231673c6bcd05.yaml

@@ -0,0 +1,10 @@
+---
+prelude: >
+  This is a first release of openstack_spec_helper.
+  This gem provides helper utilities for running rspec tests in the
+  OpenStack Puppet Modules.
+features:
+  - Add beaker spec helper.
+  - Add Rake tasks.
+  - Add Defaults facts.
+  - Add shared_examples_acceptance.

releasenotes/notes/use-reno-1caaec4ba5aa4285.yaml

@@ -1,6 +0,0 @@
----
-prelude: >
-   Release notes are generated by Reno.
-features:
-  - Release notes are no longer maintained by hand, we now use the reno tool to
-    manage them.