Change Details

`make check` `test_runner.py --extended` [x] IBD with -checkpoints=0 and -assumevalid=0 on testnet [ ] IBD with -checkpoints=0 and -assumevalid=0 on mainnet

`make check` `test_runner.py --extended` [x] IBD with -checkpoints=0 and -assumevalid=0 on testnet [x] IBD with -checkpoints=0 and -assumevalid=0 on mainnet

`make check` `test_runner.py --extended` [x] IBD with -checkpoints=0 and -assumevalid=0 on testnet [ x] IBD with -checkpoints=0 and -assumevalid=0 on mainnet