Adding upstream version 16.2.11+ds.upstream/16.2.11+dsupstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

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+Building Ceph Documentation
+===========================
+
+Ceph utilizes Python's Sphinx documentation tool. For details on
+the Sphinx documentation tool, refer to `The Sphinx Documentation Tool <https://www.sphinx-doc.org/en/master/>`_.
+
+To build the Ceph documentation set, you must:
+
+1. Clone the Ceph repository
+2. Install the required tools
+3. Build the documents
+4. Demo the documents (Optional)
+
+.. highlight:: bash
+
+Clone the Ceph Repository
+-------------------------
+
+To clone the Ceph repository, you must have ``git`` installed
+on your local host. To install ``git``, execute::
+
+	sudo apt-get install git
+
+To clone the Ceph repository, execute::
+
+	git clone git://github.com/ceph/ceph
+
+You should have a full copy of the Ceph repository.
+
+
+Install the Required Tools
+--------------------------
+
+To build the Ceph documentation, some dependencies are required.
+To know what packages are needed, you can launch this command::
+
+    cd ceph
+    admin/build-doc
+
+If dependencies are missing, the command above will fail
+with a message that suggests you a command to install all
+missing dependencies.
+
+
+Build the Documents
+-------------------
+
+Once you have installed all the dependencies, execute the build (the
+same command as above)::
+
+	cd ceph
+	admin/build-doc
+
+Once you build the documentation set, you may navigate to the source directory to view it::
+
+	cd build-doc/output
+
+There should be an ``html`` directory and a ``man`` directory containing documentation
+in HTML and manpage formats respectively.
+
+``admin/build-doc`` takes a long time to prepare the environment and build the document.
+But you can just rebuild the document on changes using::
+
+  admin/build-doc livehtml
+
+This feature uses ``sphinx-autobuild`` under the hood. You can also pass options to it. For
+instance, to open the browser after building the documentation::
+
+  admin/build-doc livehtml -- --open-browser
+
+Please see `sphinx-autobuild <https://pypi.org/project/sphinx-autobuild/>`_ for more details.
+
+Demo the Documents
+-------------------
+
+Once you build the documentation, as described above, you can demo the rendered documents
+by running ``serve-doc``::
+
+	cd ceph
+	admin/serve-doc
+
+This will serve the ``build-doc/output/html`` directory over port 8080 via 
+Python's ``SimpleHTTPServer`` module.