Moodle Redis TLS support

lib.php

protected function new_redis($server, $prefix = '', $password = '') {
    $redis = new Redis();
    // Check if it isn't a Unix socket to set default port.
    $port = ($server[0] === '/') ? null : 6379;

    // NOTE: This is the change we added
    // You can supply eg tls://my.redis.host:6380/ for it to work
    // Check for any protocol requirements eg TLS that have been specified.
    if (strpos($server, ':')) {
        $serverconf = parse_url($server);

        $port = $serverconf['port'] ?? $port;
        $scheme = $serverconf['scheme'] ?? '';
        $host = $serverconf['host'] ?? '';
        $server = (strlen($scheme) ? $scheme . '://' : '');
        $server .= $host;
    }

    // ...
}