Initial python3 changes

Mostly just updating libraries, removing string encoding/decoding,
fixing some edge cases. No new functionality was added in this
commit.

lib/logutils/__init__.py

@@ -111,7 +111,7 @@ class Formatter(logging.Formatter):
         """
         if style not in _STYLES:
             raise ValueError('Style must be one of: %s' % ','.join(
-                             _STYLES.keys()))
+                             list(_STYLES.keys())))
         self._style = _STYLES[style](fmt)
         self._fmt = self._style._fmt
         self.datefmt = datefmt