Feature/autodeploy testing tweaks

Some minor tweaks to get the ansible/Jenkins autodeployment to work with lti_tools project:
- rename `stage.txt` requirements file to `demo.txt` to correspond with demo settings file
- make a previously managed model in confluence_wiki project unmanaged so that syncdb call works
- update log location and redis cache server in AWS environment settings files
- update `django_db_pass` key to be consistent across environments
- remove a pair of unused secure settings key/value pairs