turn off eventlet.wsgi debug

eventlet's wsgi server has a debug mode. This triggers in 3 cases:

1) returning a stack trace to the user on 500 error
2) printing 'accepted'... on every wsgi request
3) printing timeout on time out scenarios

In a real OpenStack environment #2 is basically what we see, all
the time, on *every* request. This ends up adding a lot of log
spam at INFO level.

Future eventlet will use real python logging, which will let us
log the debug messages at DEBUG level, but until then we should
clean out the logs to be vaguely sane.

Change-Id: Ifb92d25949568612d4a34a996752f33bc728b58b
Merge "turn off eventlet.wsgi debug"