Connect to "localhost" from interop clients.
This is for compatibility with IPv6-only environments; see the Google
bug b/32531998.
Note that InteropClient.cs and http2_client.cc don't appear to be tested
by our internal branch, but I've included them for consistency.
diff --git a/test/cpp/interop/reconnect_interop_client.cc b/test/cpp/interop/reconnect_interop_client.cc
index 797e52c..1c2f606 100644
--- a/test/cpp/interop/reconnect_interop_client.cc
+++ b/test/cpp/interop/reconnect_interop_client.cc
@@ -48,7 +48,7 @@
DEFINE_int32(server_control_port, 0, "Server port for control rpcs.");
DEFINE_int32(server_retry_port, 0, "Server port for testing reconnection.");
-DEFINE_string(server_host, "127.0.0.1", "Server host to connect to");
+DEFINE_string(server_host, "localhost", "Server host to connect to");
DEFINE_int32(max_reconnect_backoff_ms, 0,
"Maximum backoff time, or 0 for default.");