blockchain: Reject params with shared mask bits. #3077
Merged
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This requires #3076.This adds an additional validation check to the chain initialization process to validate that the masks of votes in the same deployment versions in the given chain params do not have any shared bits along with a test for the new validation logic.
Since some of the tests violate this condition, it also introduces a helper func to the tests that updates the masks and choice bits for all votes in a provided test agenda so that they are non-overlapping and then updates a couple of the tests that merge votes into the same agenda to make use of the func so they no longer involve overlapping bits.