Initial python3 changes

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

lib/cherrypy/process/__init__.py

@@ -10,5 +10,8 @@ use with the bus. Some use tool-specific channels; see the documentation
 for each class.
 """
 
-from cherrypy.process.wspbus import bus
-from cherrypy.process import plugins, servers
+from .wspbus import bus
+from . import plugins, servers
+
+
+__all__ = ('bus', 'plugins', 'servers')