Refactored P4 test

A more descriptive name is put to the p4 test so as to leave space for additional tests coming soon. This test applies L1 forwarding between a P4 switch's ports, thus the new name of this test is set accordingly.

Closes issue #219 (closed)

src/tests/p4-fwd-l1/probe/probe-tfs/src/agent.rs

@@ -195,6 +195,7 @@ async fn main() -> Result<(), Box<dyn std::error::Error>> {
                     endpoint_id: None,
                     slice_id: None,
                     connection_id: None,
+                    link_id: None,
                     kpi_description: format!(
                         "Latency value for service {}",
                         event_service.service_uuid.unwrap().uuid