Incorrect calculate blockchain hash in evm rpc module

[louisliu2048]

System info: [Include Ethermint commit, operating system name, and other relevant details]
In app/rpc/namespace directory, the method to get blockHash is:
blockHash := common.BytesToHash(block.Block.Header.Hash())
but in tendermint, the method to get blockHash is:
tendermint/state/execution.go:284

	// Begin block
	var err error
	abciResponses.BeginBlock, err = proxyAppConn.BeginBlockSync(abci.RequestBeginBlock{
		Hash:                block.Hash(),
		Header:              types.TM2PB.Header(&block.Header),
		LastCommitInfo:      commitInfo,
		ByzantineValidators: byzVals,
	})

Header.Hash() will not include LastCommit *Commit info!
The current method will introduce #721 error.

Steps to reproduce:

1. [First Step]
2. [Second Step]
3. [and so on...]

Expected behavior: [What you expected to happen]

Actual behavior: [What actually happened]

Additional info: [Include gist of relevant config, logs, etc.]

[fedekunze]

closed via #755