Remove obsolete binary packages from install

Since this repo is now completely RST docs based, we do not need the
tools for XML handling anymore, remove all the dependencies from
installation.

Add python-devel for RPM platforms.

Note that this test is self-testing - the new config will be used
directly in the OpenStack CI system.

Change-Id: I13f822b7f1f93fe16997c07671ea3ab18c006528

bindep.txt

@@ -7,18 +7,11 @@ fonts-nanum [platform:dpkg]
 fonts-takao [platform:dpkg]
 freetype-devel [platform:rpm]
 gettext
-gnome-doc-utils
 libfreetype6-dev [platform:dpkg]
 libjpeg-dev [platform:dpkg]
 libjpeg-turbo-devel [platform:rpm]
-libxml2-dev [platform:dpkg]
-libxml2-devel [platform:rpm]
-libxml2-utils [platform:dpkg]
-libxslt-devel [platform:rpm]
-libxslt1-dev [platform:dpkg]
 python-dev [platform:dpkg]
-python-lxml
-xsltproc [platform:dpkg]
+python-devel [platform:rpm]
 zlib-devel [platform:rpm]
 zlib1g-dev [platform:dpkg]
 inkscape