Enable Redis async import

- using javibravo/simpleue
- internal config value are now `import_with_redis` & `import_with_rabbit` which are more clear
- if both option are enable rabbit will be choosen
- services imports related to async are now splitted into 2 files: `redis.yml` & `rabbit.yml`
-

app/config/parameters.yml.dist

@@ -46,3 +46,7 @@ parameters:
     rabbitmq_port: 5672
     rabbitmq_user: guest
     rabbitmq_password: guest
+
+    # Redis processing
+    redis_host: localhost
+    redis_port: 6379