cherrypy: disabling wsgi interface fails under python3

Originally reported by: Tim Miller (Bitbucket: lashni, GitHub: Unknown)

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http://docs.cherrypy.org/en/latest/advanced.html#no-need-for-the-wsgi-interface

Error is encountered when the example code from the link above is run under a python 3.4.3 virtualenv on archlinux, traceback triggers when the server is accessed. Error doesn’t occur with python 2.7.10.

Happens with both current head and CherryPy 3.8.0.

[19/Jul/2015:17:41:01] ENGINE Listening for SIGUSR1.
[19/Jul/2015:17:41:01] ENGINE Listening for SIGTERM.
[19/Jul/2015:17:41:01] ENGINE Listening for SIGHUP.
[19/Jul/2015:17:41:01] ENGINE Bus STARTING
CherryPy Checker:
The Application mounted at '' has an empty config.

[19/Jul/2015:17:41:01] ENGINE Started monitor thread '_TimeoutMonitor'.
[19/Jul/2015:17:41:01] ENGINE Started monitor thread 'Autoreloader'.
[19/Jul/2015:17:41:01] ENGINE Serving on http://127.0.0.1:8080
[19/Jul/2015:17:41:01] ENGINE Bus STARTED
[19/Jul/2015:17:41:05] NATIVE_ADAPTER Traceback (most recent call last):
  File "/home/lashni/dev/serve/lib/python3.4/site-packages/cherrypy/_cpnative_server.py", line 27, in respond
    sn = cherrypy.tree.script_name(req.uri or "/")
  File "/home/lashni/dev/serve/lib/python3.4/site-packages/cherrypy/_cptree.py", line 257, in script_name
    path = path[:path.rfind("/")]
TypeError: 'str' does not support the buffer interface

ValueError('invalid literal for int() with base 10: "b\'5"',)
Traceback (most recent call last):
  File "/home/lashni/dev/serve/lib/python3.4/site-packages/cherrypy/_cpnative_server.py", line 27, in respond
    sn = cherrypy.tree.script_name(req.uri or "/")
  File "/home/lashni/dev/serve/lib/python3.4/site-packages/cherrypy/_cptree.py", line 257, in script_name
    path = path[:path.rfind("/")]
TypeError: 'str' does not support the buffer interface

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/lashni/dev/serve/lib/python3.4/site-packages/cherrypy/wsgiserver/wsgiserver3.py", line 1068, in communicate
    req.respond()
  File "/home/lashni/dev/serve/lib/python3.4/site-packages/cherrypy/wsgiserver/wsgiserver3.py", line 856, in respond
    self.server.gateway(self).respond()
  File "/home/lashni/dev/serve/lib/python3.4/site-packages/cherrypy/_cpnative_server.py", line 88, in respond
    self.send_response(s, h, b)
  File "/home/lashni/dev/serve/lib/python3.4/site-packages/cherrypy/_cpnative_server.py", line 101, in send_response
    req.send_headers()
  File "/home/lashni/dev/serve/lib/python3.4/site-packages/cherrypy/wsgiserver/wsgiserver3.py", line 912, in send_headers
    status = int(self.status[:3])
ValueError: invalid literal for int() with base 10: "b'5"

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• Bitbucket: https://bitbucket.org/cherrypy/cherrypy/issue/1377