Tests IP filtering for TLS routes

Currently we only test the edge route type for IP filtering. We should test all 3 route types (Edge, Passthrough, Reencrypt) As of 3.6 we only have 2 cases to test: passthrough (TCP) and any other kind (HTTP). So we just need to add a test for a passthrough route

For this we need a self-signed SSL certificate and enable SSL in the backend application