Collection-Remote-Integrity: Integration

This MR aims to make Collection-Remote-Integrity K8s-ready: First, testing locally. Then in Docker network.

• Connection from REQ-Manager to Remote Integrity works

Issues:

• The Collect function blocks (grpc.WithBlock()) since I didn't specify a valid serviceID. What should we use for testing? Alternatively, we may could use mocking stuff from the tests?
• A timeout (context.WithTimeout) is introduced
• conn, err := grpc.Dial(serviceId, grpc.WithInsecure(), grpc.WithBlock()) also uses deprecated grpc.WithInsecure()
• Configuration, both target and certificate, now in RawConfiguration instead of misusingserviceID