Zun-api is using app.wsgi as log filename.
This change forzes zun-api.log to ease identification.
Also changes group owner of log dir to kolla group.
Remove glance version as is in zun's defaults
Set state_path, this is where zun will store catched images,
similar as nova cache. No need HA or volume as is only
cached data.
Change-Id: I20f8d311bfde1c0a07d7d35e9f1412c71efa8504