Comment 1 for bug 1643511

this is because mod_wsgi expects a bytes string in python2.X https://github.com/GrahamDumpleton/mod_wsgi/blob/develop/src/server/wsgi_convert.c#L27 ; it, however, accepts unicode when using python 3.X.

So if we want nova to work with mod_wsgi, it should take that into account.