REGTEST: make the HTTP rules test compatible with HTTP/2 as well

The HTTP rules test now runs an H1 and an H2 client. Since the H2 one
requires the "proto" directive on the bind line, a new file has been
created requiring version 1.9 and the previous one was marked as usable
below 1.9 so that it's skipped by default but still usable when testing
backports.
diff --git a/reg-tests/http-rules/h00000.vtc b/reg-tests/http-rules/h00000.vtc
index 252408f..25388f8 100644
--- a/reg-tests/http-rules/h00000.vtc
+++ b/reg-tests/http-rules/h00000.vtc
@@ -1,5 +1,6 @@
-varnishtest "Composite HTTP manipulation test"
+varnishtest "Composite HTTP manipulation test (H1 clear to H1 clear)"
 #REQUIRE_VERSION=1.6
+#REQUIRE_VERSION_BELOW=1.9
 
 # This config tests several http-request features and their interactions.
 # It extracts some samples, places them into variables, modifies some header