Include Pecan tests in default Python environment

- Makes sure we always run Pecan test and that there's no regression.
  There's no real need to split them out as they are not invasive.
  Also that reduces the number of environment a bit.
- This also fixes Pecan tests on python2.6
- This also fixes Pecan tests on python3.3
- This also enables Pecan tests on python3.2

Change-Id: I57070b0bd785fb3d445f432973f15825abccbdd5