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/src/hpack-dec.c b/src/hpack-dec.c
index 987165c..debd611 100644
--- a/src/hpack-dec.c
+++ b/src/hpack-dec.c
@@ -30,13 +30,13 @@
 #include <stdlib.h>
 #include <string.h>
 
-#include <haproxy/tools.h>
+#include <import/ist.h>
+#include <haproxy/chunk.h>
+#include <haproxy/h2.h>
 #include <haproxy/hpack-dec.h>
 #include <haproxy/hpack-huff.h>
 #include <haproxy/hpack-tbl.h>
-#include <haproxy/chunk.h>
-#include <haproxy/h2.h>
-#include <import/ist.h>
+#include <haproxy/tools.h>
 
 
 #if defined(DEBUG_HPACK)