Code review comment for lp:~barry/cloud-init/py2-3

This is ready for review and merging, at least modulo Python 2.6 support (which I will try to test on next).

% tox -e py27,py34
GLOB sdist-make: /home/barry/projects/ubuntu/cloudinit/py3/setup.py
py27 inst-nodeps: /home/barry/projects/ubuntu/cloudinit/py3/.tox/dist/cloud-init-0.7.7.zip
py27 runtests: PYTHONHASHSEED='2933691519'
py27 runtests: commands[0] | python -m nose tests
.............SSSSS.........................................................................................................................................................................................................................................................................................................................................................
----------------------------------------------------------------------
Ran 363 tests in 7.423s

OK (SKIP=5)
py34 inst-nodeps: /home/barry/projects/ubuntu/cloudinit/py3/.tox/dist/cloud-init-0.7.7.zip
py34 runtests: PYTHONHASHSEED='2933691519'
py34 runtests: commands[0] | python -m nose tests
.............SSSSS......................................................................................................................................................................................................................................................................................................................S..................................
----------------------------------------------------------------------
Ran 363 tests in 9.542s

OK (SKIP=6)
___________________________________ summary ____________________________________
  py27: commands succeeded
  py34: commands succeeded
  congratulations :)