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

So some tests have been removed.
diff --git a/reg-tests/connection/h00001.vtc b/reg-tests/connection/h00001.vtc
index fccd6ec..bac19d8 100644
--- a/reg-tests/connection/h00001.vtc
+++ b/reg-tests/connection/h00001.vtc
@@ -26,6 +26,7 @@
 listen fe_http
     bind "fd@${fe_http}"
     mode http
+    ${no-htx} option http-use-htx
     dispatch ${s2_addr}:${s2_port}
 } -start