Added bind/unbind app to service lifecycle test

1. added fake support for bind/unbind to broker
2. added tests to create app, service and bind/unbind
3. added tests to check that app env reflects bind/unbind

[#83067436]
Added checks for audit.app.create|restage|update

[#83067436]
Modified service broker to configure log and log requests

[#83067436]
Removed file reading of config and minor format

Load CONFIG if present and is valid JSON

[#83067436]
Delete app and service instance after tests

Was causing some polution in DB

[#83067436]