Fix TestUpdatedKeyfileContents, TestEIP155SigningVitalik and TestChainId

[tsuzukit]

For fixing TestUpdatedKeyfileContents, I have cherry-picked c86c126 and c8b5da7 which are already merged to geth 1.7.3.

For fixing TestEIP155SigningVitalik, I needed to change chainId to something other than 1 as it results in V of 37 and Tx is treated as protected transaction in Quorum (https://github.com/jpmorganchase/quorum/blob/master/core/types/transaction.go#L138).
Since http://vitalik.ca/files/eip155_testvec.txt is not currently accessible, I just created some tx and address pair. (tx creation rules are written in comments)

For same reason, I needed to change chainId for TestChainId.

Please review.

[jpmsam]

@tsuzukit Thank you for this, we'll be reviewing the changes and EIP155. In the meantime, please complete our CLA

[tsuzukit]

@jpmsam
Hi, thank you for the response and review!
I have sent CLA to [email protected].

[nujabes403]

Please merge this request quickly.. 'Invalid sender' error is critical for further developing..

[jpmsam]

@nujabes403 we are working on testing it. Please provide your feedback on whether the updates fixed the issue for you as well.

[tsuzukit]

Actually, #350 is the fix to "invalid sender".
This pull request is intended to fix some unit tests.

[jpmsam]

@tsuzukit thanks, we are in the process of testing both.

[xiaods]

the master branch it test failing in macos, please review and merge it asap.