tests: add respondd test case

tests/test_respondd.py

+#!/usr/bin/python36
+import sys
+from pynet import *
+import asyncio
+import time
+import json
+
+a = Node()
+b = Node()
+
+connect(a, b)
+
+start()
+
+b.wait_until_succeeds("ping -c 5 node1")
+
+
+def query_neighbor_info(request):
+    response = b.wait_until_succeeds(
+        f"gluon-neighbour-info -d ff02::2:1001 -p 1001 -r {request} -i vx_eth2_mesh -c 2"
+    )
+
+    # build json array line by line
+    ret = [json.loads(l) for l in response.split("\n")]
+
+    b.dbg(f"{request.lower()}:\n{json.dumps(ret, indent=4)}")
+    return ret
+
+
+neighbours = query_neighbor_info("neighbours")
+
+vx_eth2_mesh_addr_a = a.succeed("cat /sys/class/net/vx_eth2_mesh/address")
+vx_eth2_mesh_addr_b = b.succeed("cat /sys/class/net/vx_eth2_mesh/address")
+
+res0 = neighbours[0]["batadv"]
+res1 = neighbours[1]["batadv"]
+if vx_eth2_mesh_addr_a in res0:
+    res = res0
+else:
+    res = res1
+
+batadv_neighbours = res[vx_eth2_mesh_addr_a]["neighbours"]
+
+if vx_eth2_mesh_addr_b in batadv_neighbours:
+    print("Node 1 was successfully found in neighbours of node 2.")
+else:
+    print("ERROR: Node 1 was not found in neighbours of node 2.")
+    exit(1)
+
+finish()