Fixed bug in JAASSNAAModule
Removed config properties rest_api.context_path and websocket.context_path for #364
Simplified configuration by removing a lot of properties (#364)

- remove context path properties for REST API endpoints and user front-ends
- added properties for hostname and port
- removed properties for SOAP API endpoint URLs and computed them
- renamed portal.overlay.port to portal.gateway_port
- test portal component