refactor: move transport (etcp/stcp/normalizer) to transport_layer/, routing (bgp/pings/topo*) to routing_layer/

tests/test_tcp_proxy_remote.c

@@ -17,8 +17,8 @@
 #include <time.h>
 
 #include "../src/proxy/tcp_proxy_client.h"
-#include "../src/etcp.h"
-#include "../src/etcp_router.h"
+#include "etcp.h"
+#include "etcp_router.h"
 #include "../src/proxy/tcp_proxy_server.h"
 #include "../src/config_parser.h"
 #include "../src/utun_instance.h"