DOC - Adopting the common role documentation pattern

As discussed during the Newton design summit, we
agreed to adopt the role documentation pattern laid
out in the os_keystone role

Change-Id: I36d2b0c99472b470d11cac20854513c3d8b40b78

README.rst

@@ -1,14 +1,31 @@
-os_nova role
-############
-:tags: openstack, cloud, ansible, os_nova
-:category: \*nix
+OpenStack-Ansible Nova
+######################
 
-os_nova Role
+Ansible role that installs and configures OpenStack Nova and all of its
+corresponding services.
+
+Default Variables
+=================
+
+.. literalinclude:: ../../defaults/main.yml
+   :language: yaml
+   :start-after: under the License.
+
+
+Required Variables
+==================
 
 .. code-block:: yaml
+    # comma separated list of Glance internalUrls
+    glance_api_servers: "http://glance_host:9292"
 
-    - name: os_nova role
-      hosts: "hosts"
+
+Example Playbook
+================
+
+.. code-block:: yaml
+    - name: Playbook for deploying nova
+      hosts: nova_all
       user: root
       roles:
         - { role: "os_nova" }

doc/source/index.rst

@@ -1,13 +1 @@
-os_nova Docs
-============
-
-Ansible role for deploying OpenStack Nova and all of its corresponding
-services.
-
-Basic Role Example
-^^^^^^^^^^^^^^^^^^
-
-.. code-block:: yaml
-
-    - role: "os_nova"
-      ROLE_VARS...
+.. include:: ../../README.rst