disable debug in eventlet.wsgi server

the debug flag basically just means that we get lines like:

 ....wsgi.server [-] (6966) accepted ('127.0.0.1', 51944)

After *every single* wsgi request, filling up the logs with
completely irrelevant data at info level because eventlet.wsgi
does not use python logging.

Change-Id: I508b963a0c84e17df845aad260dd8ee157abbea8
Merge "disable debug in eventlet.wsgi server"