Read randomize values at the checkpoint parent height during v1 HookValidator and HookVerifyMNs instead of the latest chain state. This fixes a sync-time race where historical checkpoint headers could be rejected with ErrInvalidCheckpointValidators and then accepted later after local state advanced.
The accompanying regression test now derives expected validators independently from HookValidator and the M2 generation path uses a local RNG source, removing CI-only nondeterminism during repeated verification.
* move masternode in v2 config
* update number to meet 7 vote for current setup
* add test
* update all failed test
* fix test
* remove comment
* remove comment
* fix test
* V2 truncate MaxMasternodes from candidates after penalty,
V1 same as before
TestUpdateMultipleMasterNodes: test V2, in snapshot we have all candidates, but at epoch switch, we pick MaxMasternodes
* code looks better
* verify header including validator
* re-structure v1 v2 tests
* remove unused test function
* add test to check coinbase and validator address matches
* refactor engine v2 to group private functions into same file
