Fix a link in doc and update develsetup

This patch updates the `develsetup.rst` link in testing.rst which
is throwing 404 with the current link. And also updated the
develsetup document to link to the dmtf/README.rst for detailed
setup steps.

Change-Id: I3d27b0e06d7a236c9491333b580fcad665d56728

doc/source/develsetup.rst

@@ -5,4 +5,11 @@ Developer setup
 #. Follow `get the source code <http://pythonhosted.org/python-redfish/readme.html#get-the-source-code>`_ section to retrieve the sources.
 #. Follow `using pip and virtualenv <http://pythonhosted.org/python-redfish/installation.html#using-pip-and-virtualenv>`_ section to create your environment.
 
+To setup a development environment, the DMTF has published a mockup environment
+to simulate a Redfish based system so it is possible to write programs without
+real Redfish compliant hardware platform.
+
+Please look at _`DMTF Documentation <further_ref.html#docker-container>`_ for detailed steps.
+for setting up the environment.
+
 You can start hacking the code now.

doc/source/testing.rst

@@ -11,7 +11,7 @@ Tests are not functional for the redfish module yet.
 redfish-client tests
 --------------------
 
-#. Create your development environment following `Developer setup <develsetup.html>`_.
+#. Create your development environment following `Developer setup <http://pythonhosted.org/python-redfish/develsetup.html>`_.
 #. Install docker using the `procedure <https://docs.docker.com/engine/installation/>`_.
 #. Ensure you can use docker with your current user.
 #. Jump into the python-redfish directory containing the source code.