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

Just some minor reordering, and the usual cleanup of call places for
those which didn't need it. We don't include the whole tools.h into
stats-t anymore but just tools-t.h.
diff --git a/src/hlua_fcn.c b/src/hlua_fcn.c
index f4ac3d5..c9ef840 100644
--- a/src/hlua_fcn.c
+++ b/src/hlua_fcn.c
@@ -22,15 +22,14 @@
 #include <haproxy/http.h>
 #include <haproxy/net_helper.h>
 #include <haproxy/regex.h>
+#include <haproxy/stats.h>
 #include <haproxy/time.h>
 
 #include <types/cli.h>
 #include <types/proxy.h>
-#include <types/stats.h>
 
 #include <proto/proxy.h>
 #include <proto/server.h>
-#include <proto/stats.h>
 #include <haproxy/stick_table.h>
 
 /* Contains the class reference of the concat object. */