py3: "Modernize" code base

py3: "Modernize" code base

Run code through the 'modernize' application to fix Python 3
compatibility while also retaining Python 2 backwards compatibility.

There are some key changes made to the autogenerated code:

* Don't wrap 'items()' in 'list' for for loops - it's not necessary
* Don't wrap 'keys()' in 'list' - just drop 'keys()'
* Use Django's version of six rather than the upstream one

Many of the issues found are based upon the changed definitions of the
map, keys and items functions, along with the removal of the iteritems
function and reduce keyword.

Signed-off-by: Stephen Finucane <stephen.finucane@intel.com>