Rework random block sampling for rep crawler #4792
Merged
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This improves how random blocks are sampled for rep crawler. The issue with previous way was that it sometimes caused tests to fail, simply because block hashes were too close together and it was improbable for some to be chosen.
This was never a problem for live network where there are many more blocks, but randomly failing tests are annoying nevertheless. The new way avoids some code repetition so that's a plus.