Support Python 3 with "six" instead of running 2to3

[cvubrugier]

• Replace dict.iteritems() with six.iteritems(dict)
• Use six.string_types instead of basestring
• Remove calls to unicode() in the handle_input() function called by
  Urwid: it is not necessary. However, during my tests, I observed
  that the Urwid listbox displayed for cd is broken: I see garbage
  on the screen when moving the cursor.
• Use six.moves to import pickle on Python 3 or cPickle on Python 2
• Use six.moves to call input() on Python 3 or raw_input() on Python 2
• Add classifiers to setup.py
• Sort imports

Signed-off-by: Christophe Vu-Brugier cvubrugier@fastmail.fm

[cvubrugier]

Hi Andy,

These changes are similar to what @Haypo did for rtslib-fb. I will also submit the changes for targetcli-fb as well.

[vstinner]

You can replace "import console" with "from . import console" to limit changes. But "from .console import symbol" works also. It's not a big deal :-)

[agrover]

great! thanks!