[ServiceBus] Settlement API may not return or throw error if try timeout is long

[YijunXieMS]

ServiceBusReactorReceiver.updateDisposition does not return or throw error if try timeout is long (from about 50 seconds but no exact number, usually 10 seconds is safe) and network is down.
This is because when try timeout is long enough, ServiceBusReactorReceiver.updateDisposition() hasn't timed out while another thread closes the ServiceBusReactorReceiver and therefore causes the updateDisposition not to finish.