Use stevedore directive to document plugins

The point behind the addition of the stevedore.sphinxext extension is
"to document drivers and other types of plugins to make the available
sets built into projects easier to discover"(dhellman).

More details in the ML thread at
http://lists.openstack.org/pipermail/openstack-dev/2015-August/073338.html

Change-Id: Ib1d4c23a64cbd0010c88ff77b97b1173da302bed

doc/source/conf.py

@@ -15,7 +15,8 @@
 # extensions coming with Sphinx (named 'sphinx.ext.*') or your custom ones.
 extensions = ['sphinx.ext.todo',
               'sphinx.ext.viewcode',
-              'oslosphinx']
+              'oslosphinx',
+              'stevedore.sphinxext']
 
 # Add any paths that contain templates here, relative to this directory.
 templates_path = ['_templates']

doc/source/dev/notifier.rst

@@ -0,0 +1,6 @@
+==========================
+Available Notifier Drivers
+==========================
+
+.. list-plugins:: oslo.messaging.notify.drivers
+   :detailed:

doc/source/dev/trove_api_extensions.rst

@@ -0,0 +1,6 @@
+====================
+Trove API Extensions
+====================
+
+.. list-plugins:: trove.api.extensions
+   :detailed:

doc/source/index.rst

@@ -48,6 +48,8 @@ functionality, the following resources are provided.
   dev/install
   dev/manual_install.rst
   dev/building_guest_images.rst
+  dev/notifier.rst
+  dev/trove_api_extensions.rst
 
 * Source Code Repositories