Fix resolver tests: prefetch 40/41
These two tests were failing basically because in order for prefetching to happen, the TTL for a given DNS record must be greater than or equal to the prefetch config value + 9. The previous TTL for both records was 10, while prefetch value in configuration was 3, thus making only records with TTL >= 12 elligible for prefetching. TTL value for both records was adjusted to the value 13, and prefetch value was set to 4 (inc by 1), so records with TTL (4 + 9) >= 13 are elligible for prefetching. Adjusting prefetch value to 4 gives the test 1 second more to avoid time problems when sharing resources on a heavy loaded PC. Also prefetch value in settings is now read by the script and used by it to corrrectly calculate the amount of time needed to delay before sending a request to trigger prefetch, adding a bit of flexibility to fine tune the test in the future.
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