Redis Implementation for Shopware.

To enable redis session in your shopware 5, just follow this easy steps.

1. Create/update your engine/Shopware/Components/DependencyInjection/services_local.xml with <service id="session_factory" class="b3nl\SWRedis\DI\Bridge\Session" />
2. Overwrite the the session savehandler in your shopware config: 'session' => ['save_handler' => 'redis']
3. And define a redis config with the key sessionredis if you like. Please use the config for a predis/predis client.