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/http_fetch.c b/src/http_fetch.c
index c2b8288..585743e 100644
--- a/src/http_fetch.c
+++ b/src/http_fetch.c
@@ -16,9 +16,9 @@
 #include <string.h>
 #include <time.h>
 
+#include <haproxy/api.h>
 #include <haproxy/arg.h>
 #include <haproxy/auth.h>
-#include <haproxy/api.h>
 #include <haproxy/base64.h>
 #include <haproxy/channel.h>
 #include <haproxy/chunk.h>