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

So some tests have been removed.
diff --git a/reg-tests/lua/b00002.vtc b/reg-tests/lua/b00002.vtc
index 6f33985..6ab58f6 100644
--- a/reg-tests/lua/b00002.vtc
+++ b/reg-tests/lua/b00002.vtc
@@ -11,17 +11,20 @@
 
     frontend fe1
         mode http
+        ${no-htx} option http-use-htx
         bind "fd@${fe1}"
         default_backend b1
 
     frontend fe2
         mode http
+        ${no-htx} option http-use-htx
         bind ":8443" ssl crt ${testdir}/common.pem
         stats enable
         stats uri /
 
     backend b1
         mode http
+        ${no-htx} option http-use-htx
         http-request use-service lua.fakeserv
 } -start