test: add tcp rtt/loss test

src/config/tcp-rtt-loss-test.yaml

@@ -0,0 +1,22 @@
+# test case yaml file is only visible to the `run_test.py`
+containernet:
+  node_config:
+    config_name: default
+    config_file: predefined.node_config.yaml
+
+tests:
+  test2000:
+    description: "Test tcp with different RTT and loss rate"
+    topology:
+      config_name: linear_network_rtt_loss
+      config_file: predefined.topology.yaml
+    target_protocols: [tcp-bbr]
+    route: static_route
+    test_tools:
+      iperf:
+        interval: 1
+        interval_num: 10
+        packet_type: tcp
+        client_host: 0
+        server_host: 1
+    execution_mode: parallel # parallel or serial