Add pi4 and laptop

Pi's on 3 sides + 1 on the turret.  laptop will be the logger node at
some point in the future.

To do this, we need to edit the log file header again for the test
data...

Change-Id: I7a39d6644882e4c96dca1d689183295534d3aab4
diff --git a/aos/network/message_bridge_test.cc b/aos/network/message_bridge_test.cc
index c1dd1ca..27bed82 100644
--- a/aos/network/message_bridge_test.cc
+++ b/aos/network/message_bridge_test.cc
@@ -97,7 +97,7 @@
   int ping_count = 0;
   int pi1_server_statistics_count = 0;
   ping_event_loop.MakeWatcher(
-      "/aos/pi1",
+      "/pi1/aos",
       [&ping_count, &pi2_client_event_loop, &ping_sender,
        &pi1_server_statistics_count](const ServerStatistics &stats) {
         LOG(INFO) << FlatbufferToJson(&stats);
@@ -139,7 +139,7 @@
   // Confirm both client and server statistics messages have decent offsets in
   // them.
   int pi2_server_statistics_count = 0;
-  pong_event_loop.MakeWatcher("/aos/pi2", [&pi2_server_statistics_count](
+  pong_event_loop.MakeWatcher("/pi2/aos", [&pi2_server_statistics_count](
                                               const ServerStatistics &stats) {
     LOG(INFO) << FlatbufferToJson(&stats);
     for (const ServerConnection *connection : *stats.connections()) {
@@ -157,7 +157,7 @@
 
   int pi1_client_statistics_count = 0;
   ping_event_loop.MakeWatcher(
-      "/aos/pi1", [&pi1_client_statistics_count](const ClientStatistics &stats) {
+      "/pi1/aos", [&pi1_client_statistics_count](const ClientStatistics &stats) {
         LOG(INFO) << FlatbufferToJson(&stats);
 
         for (const ClientConnection *connection : *stats.connections()) {
@@ -176,7 +176,7 @@
       });
 
   int pi2_client_statistics_count = 0;
-  pong_event_loop.MakeWatcher("/aos/pi2", [&pi2_client_statistics_count](
+  pong_event_loop.MakeWatcher("/pi2/aos", [&pi2_client_statistics_count](
                                               const ClientStatistics &stats) {
     LOG(INFO) << FlatbufferToJson(&stats);
 
@@ -191,11 +191,11 @@
     }
   });
 
-  ping_event_loop.MakeWatcher("/aos/pi1", [](const Timestamp &timestamp) {
+  ping_event_loop.MakeWatcher("/pi1/aos", [](const Timestamp &timestamp) {
     EXPECT_TRUE(timestamp.has_offsets());
     LOG(INFO) << FlatbufferToJson(&timestamp);
   });
-  pong_event_loop.MakeWatcher("/aos/pi2", [](const Timestamp &timestamp) {
+  pong_event_loop.MakeWatcher("/pi2/aos", [](const Timestamp &timestamp) {
     EXPECT_TRUE(timestamp.has_offsets());
     LOG(INFO) << FlatbufferToJson(&timestamp);
   });