disable gunicorn access logs

they're turning up in syslog, which means they're getting into kibana now

also move config settings from manifest to gunicorn_config.py

manifest-base.yml

@@ -5,10 +5,6 @@ command: >
   scripts/run_app_paas.sh
   gunicorn
   -c /home/vcap/app/gunicorn_config.py
-  --error-logfile /home/vcap/logs/gunicorn_error.log
-  -w 5
-  -b 0.0.0.0:$PORT
-  -k eventlet
   application
 
 instances: 1