Improve the ability to configure the deployment

[Haifischbecken]

It is currently not possible to change the url of any related resource (rabbitmq, redis, fileservice) leading to possible collisions with other services, this should be changed in the future. Also the password for rabbitmq is hardcoded to pikas default which is not a longterm solution. Redis in the meanwhile has no authentication set up at all. Both are not available from outside the k8s cluster so this is not a big issue but might become one if user what to use existing resources.