Change build to use python 3, minor lint fixes

Change-Id: I3a07c58efb8b676f77426a6ff8cb3e40f13d3f1f
diff --git a/installation.rst b/installation.rst
index 2ebea50..c1502a1 100644
--- a/installation.rst
+++ b/installation.rst
@@ -342,7 +342,7 @@
 
 - To **stop** OF-DPA and OpenFlow agent, run:
 
-  .. code-block:: consol
+  .. code-block:: console
 
      # killall ofagentapp