REGTESTS: Use `feature cmd` for 2.5+ tests (2)

This patch effectively is identical to 7ba98480cc5b2ede0fd4cca162959f66beb82c82.
diff --git a/reg-tests/http-messaging/srv_ws.vtc b/reg-tests/http-messaging/srv_ws.vtc
index bce12f6..32369a1 100644
--- a/reg-tests/http-messaging/srv_ws.vtc
+++ b/reg-tests/http-messaging/srv_ws.vtc
@@ -3,11 +3,10 @@
 
 varnishtest "h2 backend websocket management via server keyword"
 
+feature cmd "$HAPROXY_PROGRAM -cc 'version_atleast(2.5-dev0)'"
+feature cmd "$HAPROXY_PROGRAM -cc 'feature(OPENSSL)'"
 feature ignore_unknown_macro
 
-#REQUIRE_VERSION=2.5
-#REQUIRE_OPTION=OPENSSL
-
 # haproxy server
 haproxy hapsrv -conf {
 	defaults