REGTESTS: Use `feature cmd` for 2.5+ tests

Using `REQUIRE_VERSION` is deprecated for tests targeting HAProxy with `-cc`
support.

reg-tests/http-messaging/scheme_based_normalize.vtc

@@ -1,6 +1,6 @@
 varnishtest "scheme based normalization (rfc3982 6.3.2)"
-#REQUIRE_VERSION=2.5
 
+feature cmd "$HAPROXY_PROGRAM -cc 'version_atleast(2.5-dev0)'"
 feature ignore_unknown_macro
 
 syslog S1 -level info {

reg-tests/server/cli_delete_server.vtc

@@ -3,10 +3,9 @@
 #
 varnishtest "Delete server via cli"
 
+feature cmd "$HAPROXY_PROGRAM -cc 'version_atleast(2.5-dev0)'"
 feature ignore_unknown_macro
 
-#REQUIRE_VERSION=2.5
-
 haproxy h1 -conf {
 	defaults
 		mode http

reg-tests/server/cli_delete_server_lua.vtc

@@ -2,11 +2,10 @@
 # cannot be removed at runtime.
 varnishtest "Delete lua server via cli"
 
+feature cmd "$HAPROXY_PROGRAM -cc 'version_atleast(2.5-dev0)'"
+feature cmd "$HAPROXY_PROGRAM -cc 'feature(LUA)'"
 feature ignore_unknown_macro
 
-#REQUIRE_VERSION=2.5
-#REQUIRE_OPTIONS=LUA
-
 server s1 {
 	rxreq
 	txresp