Add retry_max_delay option

- add option
- add test

test.js

@@ -1798,6 +1798,28 @@ tests.auth = function () {
     });
 };
 
+tests.reconnectRetryMaxDelay = function() {
+	var time = new Date().getTime(),
+		name = 'reconnectRetryMaxDelay',
+		reconnecting = false;
+	var client = redis.createClient(PORT, HOST, {
+		retry_max_delay: 1
+	});
+	client.on('ready', function() {
+		if (!reconnecting) {
+			reconnecting = true;
+			client.retry_delay = 1000;
+			client.retry_backoff = 1;
+			client.stream.end();
+		} else {
+			client.end();
+			var lasted = new Date().getTime() - time;
+			assert.ok(lasted < 1000);
+			next(name);
+		}
+	});
+};
+
 all_tests = Object.keys(tests);
 all_start = new Date();
 test_count = 0;