Updates python3.4 dependencies in docs

In order to run the unit tests within the python3.4 testing
environment. This patch adds those dependencies to the docs and
also specifies how to run the tests.

Change-Id: Ib6b7db0a20dfb38ed00a848fab8ff33a93365cdb

doc/source/testing.rst

@@ -15,7 +15,7 @@ refer to the `tox documentation`_ for assistance.
 Unit Tests
 ----------
 
-Currently, we provide tox environments for Python 2.7. By default
+Currently, we provide tox environments for Python 2.7 and 3.4. By default
 all available test environments within the tox configuration will execute
 when calling ``tox``. If you want to run them independently, you can do so
 with the following command:
@@ -66,6 +66,31 @@ want to examine, then running the following command:
     For a list of pdb commands, please see:
     https://docs.python.org/2/library/pdb.html
 
+**Python 3.4**
+
+In order to run the unit tests within the Python 3.4 unit testing environment
+you need to make sure you have all necessary packages installed.
+
+- On Ubuntu/Debian::
+
+    sudo apt-get install python3-dev
+
+- On Fedora 21/RHEL7/CensOS7::
+
+    sudo yum install python3-devel
+
+- On Fedora 22 and higher::
+
+    sudo dnf install python3-devel
+
+You then specify to run the unit tests within the Python 3.4 environment when
+invoking tox
+
+.. code-block:: bash
+
+    # Executes tests on Python 3.4
+    tox -e py34
+
 Functional Tests
 ----------------