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/stick_table.c b/src/stick_table.c
index ebb9033..a79defc 100644
--- a/src/stick_table.c
+++ b/src/stick_table.c
@@ -22,6 +22,7 @@
 #include <haproxy/list.h>
 #include <haproxy/net_helper.h>
 #include <haproxy/peers.h>
+#include <haproxy/stats-t.h>
 #include <haproxy/task.h>
 #include <haproxy/tcp_rules.h>
 #include <haproxy/tools.h>
@@ -31,7 +32,6 @@
 #include <import/ebsttree.h>
 
 #include <types/cli.h>
-#include <types/stats.h>
 
 #include <haproxy/arg.h>
 #include <proto/cli.h>