Delete of a service should offer an option to specify the date for service disconnect
IX-API allows services to be disconnected using a DELETE /network-services-config request. This does not allow the requestor to specify the date for a disconnect and implicitly the Internet Exchange shall disconnect the service at the end of the notice period. However, sometimes the requestor may want the service disconnect to happen immediately (to use the freed resources for another purpose) whereby they accept they will still be billed for the notice period. The IX-API needs to evolve to support his kind of scenario. Additionally, flexibility should exist for the the requestor to request any date between the request date and the contract notice period date.