Make tempest's python 2.6 policy clear

This commit adds a few sentences to the end of the python 2.6 section
in the readme to clearly articulate that there is no python 2.6 in
tempest starting with kilo, and that patches to fix python 2.6 support
will be rejected.

Change-Id: I28b4714e35b84642be47961d3f51343450504db7
diff --git a/README.rst b/README.rst
index 5284bbf..7af0025 100644
--- a/README.rst
+++ b/README.rst
@@ -124,14 +124,14 @@
 Python 2.6
 ----------
 
-Tempest can be run with Python 2.6 however the unit tests and the gate
-currently only run with Python 2.7, so there are no guarantees about the state
-of tempest when running with Python 2.6. Additionally, to enable testr to work
-with tempest using python 2.6 the discover module from the unittest-ext
-project has to be patched to switch the unittest.TestSuite to use
-unittest2.TestSuite instead. See:
-
-https://code.google.com/p/unittest-ext/issues/detail?id=79
+Starting in the kilo release the OpenStack services dropped all support for
+python 2.6. This change has been mirrored in tempest, starting after the
+tempest-2 tag. This means that proposed changes to tempest which only fix
+python 2.6 compatibility will be rejected, and moving forward more features not
+present in python 2.6 will be used. If you're running you're OpenStack services
+on an earlier release with python 2.6 you can easily run tempest against it
+from a remote system running python 2.7. (or deploy a cloud guest in your cloud
+that has python 2.7)
 
 Branchless Tempest Considerations
 ---------------------------------