Enable dig retries in legacy system test

Michal Nowak requested to merge 3916-legacy-test-enable-dig-retries into main

This change partially reverts 47b85034, which made +tries=1 +time=2 the default dig options to speed up dig timeouts because several timeouts are expected in the legacy test. Test runtime was more than halved as a result. However, defaulting to +tries=1 prevents dig from retrying, which is not helpful when the system is under a high load. We can keep the decreased test runtime while letting most dig instances retry if we disable retry only when dig is expected to fail.

Closes #3916 (closed)

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