Convert all HTML doc to RST

The motivation for this conversion is to have DevStack's docs be
generated using a more familair workflow for OpenStack projects, using
Sphinx.

Changing from raw HTML to RST will also make it easier to contribute
more documentation, as well as making edits less of a hassle.

The majority of the work was done by using Pandoc to convert from HTML
to RST, with minor edits to the output to remove errors in Sphinx.

Change-Id: I9636017965aeade37b950ddf5bdb0c22ab9004bd
diff --git a/tox.ini b/tox.ini
index 3677631..b6f2d96 100644
--- a/tox.ini
+++ b/tox.ini
@@ -16,8 +16,13 @@
 deps =
    Pygments
    docutils
+   sphinx>=1.1.2,<1.2
+   pbr>=0.6,!=0.7,<1.0
+   oslosphinx
 whitelist_externals = bash
 setenv =
   TOP_DIR={toxinidir}
   INSTALL_SHOCCO=true
-commands = bash tools/build_docs.sh
+commands = 
+	bash tools/build_docs.sh
+	python setup.py build_sphinx