Python < 3.5 tests

[Brian May <brian@microcomaustralia.com.au>]

Hello,

When debugging #801208, I noticed the following output:

   dh_auto_test -O--buildsystem=pybuild
   I: pybuild base:170: cd /«PKGBUILDDIR»/.pybuild/pythonX.Y_2.7/build;
   python2.7 -m unittest discover -v 

   ----------------------------------------------------------------------
   Ran 0 tests in 0.000s

   OK
   I: pybuild base:170: cd /«PKGBUILDDIR»/.pybuild/pythonX.Y_3.4/build;
   python3.4 -m unittest discover -v 

   ----------------------------------------------------------------------
   Ran 0 tests in 0.000s

   OK
   I: pybuild base:170: cd /«PKGBUILDDIR»/.pybuild/pythonX.Y_3.5/build;
   python3.5 -m unittest discover -v 
   ajax_select (unittest.loader._FailedTest) ... ERROR

So it looks like it can't find the tests under Python 2.7 or Python 3.4,
so it use to work, however under Python 3.5 it now does find the tests
and they fail.

This left me wondering:

* Why does it not find the tests under Python 2.7, 3.4? What is
  different about Python 3.5 that it does?
* Why is Python 3.4 still relevant? Hasn't 3.5 replaced 3.4? Why is it
  being tested by pybuild?

Regards