Disable duplicate sites check in summariser
Disable duplicate sites check in summariser

- Disable duplicate sites check in summariser as it doesn't scale well and
  it isn't that useful as it completely stops the summarising process if
  it detects a site sending both job records and summaries.

tofu-rocketry/apel,apel/apel,apel/apel,stfc/apel,tofu-rocketry/apel,stfc/apel