tests: test IP transports under various combos of address family/scope

In particular, link-local addresses are now tested as well.

Additionally, WebSocketTransport send/receive tests are extended
to check transport counters.

Change-Id: I5b35f498a5d8d70cb1f7a2bea3ce99d22370e050
Refs: #1428
diff --git a/tests/daemon/face/websocket-channel.t.cpp b/tests/daemon/face/websocket-channel.t.cpp
index 5c1a60d..439422f 100644
--- a/tests/daemon/face/websocket-channel.t.cpp
+++ b/tests/daemon/face/websocket-channel.t.cpp
@@ -27,7 +27,7 @@
 #include "face/websocket-transport.hpp"
 
 #include "channel-fixture.hpp"
-#include "test-netif-ip.hpp"
+#include "test-ip.hpp"
 
 namespace nfd {
 namespace face {