tools: add python grpc ListPeer API example

Signed-off-by: FUJITA Tomonori <fujita.tomonori@gmail.com>

tools/grpc/python/list_peer.py

@@ -0,0 +1,31 @@
+#!/usr/bin/env python
+
+from __future__ import absolute_import
+from __future__ import print_function
+
+import grpc
+from google.protobuf.any_pb2 import Any
+
+import gobgp_pb2
+import gobgp_pb2_grpc
+import attribute_pb2
+
+_TIMEOUT_SECONDS = 1000
+
+
+def run():
+    channel = grpc.insecure_channel('localhost:50051')
+    stub = gobgp_pb2_grpc.GobgpApiStub(channel)
+
+    peers = stub.ListPeer(
+        gobgp_pb2.ListPeerRequest(
+        ),
+        _TIMEOUT_SECONDS,
+    )
+
+    for peer in peers:
+        print(peer)
+
+
+if __name__ == '__main__':
+    run()