REGTEST: Add option to use HTX prefixed by the macro 'no-htx'

So some tests have been removed.
diff --git a/reg-tests/stick-table/b00001.vtc b/reg-tests/stick-table/b00001.vtc
index 43e25eb..3435712 100644
--- a/reg-tests/stick-table/b00001.vtc
+++ b/reg-tests/stick-table/b00001.vtc
@@ -27,6 +27,7 @@
     # Configuration file of 'h1' haproxy instance.
     defaults
         mode   http
+        ${no-htx} option http-use-htx
         timeout connect         5s
         timeout server          30s
         timeout client          30s