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/vars.c b/src/vars.c
index 9ba1720..b154c52 100644
--- a/src/vars.c
+++ b/src/vars.c
@@ -1,7 +1,7 @@
 #include <ctype.h>
 
-#include <haproxy/arg.h>
 #include <haproxy/api.h>
+#include <haproxy/arg.h>
 #include <haproxy/cfgparse.h>
 #include <haproxy/check.h>
 #include <haproxy/global.h>
@@ -11,8 +11,8 @@
 #include <haproxy/log.h>
 #include <haproxy/sample.h>
 #include <haproxy/stream-t.h>
-#include <haproxy/tcpcheck.h>
 #include <haproxy/tcp_rules.h>
+#include <haproxy/tcpcheck.h>
 #include <haproxy/vars.h>