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/http_act.c b/src/http_act.c
index 37966f3..4c283283 100644
--- a/src/http_act.c
+++ b/src/http_act.c
@@ -29,6 +29,7 @@
 #include <haproxy/pool.h>
 #include <haproxy/regex.h>
 #include <haproxy/sample.h>
+#include <haproxy/stream_interface.h>
 #include <haproxy/tools.h>
 #include <haproxy/uri_auth-t.h>
 #include <haproxy/version.h>
@@ -38,7 +39,6 @@
 #include <haproxy/arg.h>
 #include <proto/log.h>
 #include <proto/http_ana.h>
-#include <proto/stream_interface.h>
 
 /* Release memory allocated by most of HTTP actions. Concretly, it releases
  * <arg.http>.