First crack at restoring mininet python style, assisted by handy

'unpep8' script, which does most of the work.

- topo.py is still in pep8
- not all examples work, but this is due to other issues

bin/mn

@@ -130,7 +130,7 @@ class MininetRunner(object):
         '''Setup and validate environment.'''
 
         # set logging verbosity
-        lg.set_loglevel(self.options.verbosity)
+        lg.setLogLevel(self.options.verbosity)
 
         # validate environment setup
         init()