CLEANUP: include: tree-wide alphabetical sort of include files

This patch fixes all the leftovers from the include cleanup campaign. There
were not that many (~400 entries in ~150 files) but it was definitely worth
doing it as it revealed a few duplicates.
diff --git a/include/haproxy/backend-t.h b/include/haproxy/backend-t.h
index af05cc8..daaf386 100644
--- a/include/haproxy/backend-t.h
+++ b/include/haproxy/backend-t.h
@@ -22,6 +22,7 @@
 #ifndef _HAPROXY_BACKEND_T_H
 #define _HAPROXY_BACKEND_T_H
 
+#include <haproxy/api-t.h>
 #include <haproxy/lb_chash-t.h>
 #include <haproxy/lb_fas-t.h>
 #include <haproxy/lb_fwlc-t.h>
@@ -29,7 +30,6 @@
 #include <haproxy/lb_map-t.h>
 #include <haproxy/server-t.h>
 #include <haproxy/thread-t.h>
-#include <haproxy/api-t.h>
 
 /* Parameters for lbprm.algo */