Use the oslo.config sphinx module to generate sample

This commit switches to using the oslo.config sphinx extension to
generate a sample config instead of doing it manually in the docs'
conf.py module.

Change-Id: I7032cb4f56c728911ffa5c6911eb504f53bc80af

.gitignore

@@ -19,4 +19,4 @@ build
 .coverage*
 !.coveragerc
 cover/
-doc/source/_static/tempest.conf
+doc/source/_static/tempest.conf.sample

doc/source/conf.py

@@ -15,18 +15,6 @@ import sys
 import os
 import subprocess
 
-# Build a tempest sample config file:
-def build_sample_config(app):
-    root_dir = os.path.dirname(
-        os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
-    subprocess.call(["oslo-config-generator", "--config-file",
-                     "tools/config/config-generator.tempest.conf",
-                     "--output-file", "doc/source/_static/tempest.conf"],
-                    cwd=root_dir)
-
-def setup(app):
-    app.connect('builder-inited', build_sample_config)
-
 # 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.
@@ -42,9 +30,13 @@ def setup(app):
 extensions = ['sphinx.ext.autodoc',
               'sphinx.ext.todo',
               'sphinx.ext.viewcode',
-              'oslosphinx'
+              'oslosphinx',
+              'oslo_config.sphinxconfiggen',
              ]
 
+config_generator_config_file = '../../tools/config/config-generator.tempest.conf'
+sample_config_basename = '_static/tempest'
+
 todo_include_todos = True
 
 # Add any paths that contain templates here, relative to this directory.

doc/source/sampleconf.rst

@@ -8,7 +8,6 @@ auto-generated from Tempest when this documentation is built, so
 if you are having issues with an option, please compare your version of
 Tempest with the version of this documentation.
 
-The sample configuration can also be viewed in `file form <_static/tempest.conf>`_.
+The sample configuration can also be viewed in `file form <_static/tempest.conf.sample>`_.
 
-.. include:: _static/tempest.conf
-   :code:
+.. literalinclude:: _static/tempest.conf.sample