clean up test-block-generators to be more useful for future work

[arvidn]

This tool is useful when validating changes to run_block_generator() against all blocks on mainnet or testnet11. For example, validating that signature validation passes on all blocks.

The old flag test-backrefs no longer worked and was removed.

The assert args.validate && !args.mempool was incorrect and was removed.

The option --validate did not work past the hard fork height, which was fixed. It was also renamed to --original-generator.

A new option --hard-fork-height was added to support testnet databases.

[coveralls-official[bot]]

Pull Request Test Coverage Report for Build 11192375114

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 83.42%

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Totals
Change from base Build 11165912337:	0.0%
Covered Lines:	12483
Relevant Lines:	14964

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