MDL-40415 add explicit OPcache support

admin/cli/install_database.php

@@ -36,6 +36,12 @@ if (isset($_SERVER['REMOTE_ADDR'])) {
     exit(1);
 }
 
+// Force OPcache reset if used, we do not want any stale caches
+// when preparing test environment.
+if (function_exists('opcache_reset')) {
+    opcache_reset();
+}
+
 $help =
 "Advanced command line Moodle database installer.
 Please note you must execute this script with the same uid as apache.