REORG: include: move stream_interface.h to haproxy/stream_interface{,-t}.h

Almost no changes, removed stdlib and added buf-t and connection-t to
the types to avoid a warning.
diff --git a/src/tools.c b/src/tools.c
index 59903b1..52522cb 100644
--- a/src/tools.c
+++ b/src/tools.c
@@ -47,10 +47,10 @@
 #include <haproxy/listener.h>
 #include <haproxy/namespace.h>
 #include <haproxy/ssl_sock.h>
+#include <haproxy/stream_interface.h>
 #include <haproxy/task.h>
 #include <haproxy/tools.h>
 #include <haproxy/proto_udp.h>
-#include <proto/stream_interface.h>
 
 /* This macro returns false if the test __x is false. Many
  * of the following parsing function must be abort the processing