Add plugin registry generation to sphinx build

This commit adds running the plugin registry generation script to the
sphinx build. This ensure that every time we build the docs we'll have
an up-to-date plugin registry. This comes at the cost of increased
build time since the script will query openstack's git server to get
the plugin list. Also, the plugin-registry source file was added to
.gitignore since it is autogenerated now.

Change-Id: Ib26124c5d5d5ef4617e4e702e594ce7f1795ce23

.gitignore

@@ -23,6 +23,7 @@ build
 !.coveragerc
 cover/
 doc/source/_static/tempest.conf.sample
+doc/source/plugin-registry.rst
 
 # Files created by releasenotes build
 releasenotes/build

doc/source/conf.py

@@ -15,6 +15,17 @@ import sys
 import os
 import subprocess
 
+# Build the plugin registry
+def build_plugin_registry(app):
+    root_dir = os.path.dirname(
+        os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
+    subprocess.call(['tools/generate-tempest-plugins-list.sh'], cwd=root_dir)
+
+def setup(app):
+    app.connect('builder-inited', build_plugin_registry)
+
+
+
 # If extensions (or modules to document with autodoc) are in another directory,
 # add these directories to sys.path here. If the directory is relative to the
 # documentation root, use os.path.abspath to make it absolute, like shown here.

doc/source/plugin-registry.rst

@@ -1,23 +0,0 @@
-..
-  Note to patch submitters: this file is covered by a periodic proposal
-  job.  You should edit the files data/tempest-plugins-registry.footer
-  data/tempest-plugins-registry.header instead of this one.
-
-==========================
- Tempest Plugin Registry
-==========================
-
-Since we've created the external plugin mechanism, it's gotten used by
-a lot of projects. The following is a list of plugins that currently
-exist.
-
-Detected Plugins
-================
-
-The following will list plugins that a script has found in the openstack/
-namespace, which includes but is not limited to official OpenStack
-projects.
-
-+----------------------------+-------------------------------------------------------------------------+
-|Plugin Name                 |URL                                                                      |
-+----------------------------+-------------------------------------------------------------------------+