go/oasis-node/cmd: Show Genesis document's hash when displaying transactions

[tjanez]

Show Genesis document's hash when generating staking transactions with oasis-node stake account gen_* CLI commands, e.g.:

You are about to sign the following transaction:
  Nonce:  1
  Fee:    2000 (gas limit: 1000, gas price: 2)
  Method: staking.AddEscrow
  Body:
    Account: oasis1qpl4axynedmdrrgrg7dpw3yxc4a8crevr5dkuksl
    Amount:  AMBER 208.0
Other info:
  Genesis document's hash: 0b9ddeaa80431ff3718f928e654e4b64cbd3f956d69d64e9c923e30766706a11

You may need to review the transaction on your device if you use a hardware-based signer plugin...

And when showing transactions' pretty prints with the oasis-node consensus show_tx CLI command, e.g.:

Hash: 144bf255028a13ec03c2c19879658a97de44e32adb9750690ac2579a4df81518
Signer: l+cuboPsOeuY1+kYlROrpmKgiiELmXSw9xl0WEg8cWE=
        (signature: e1Zp1ttZRlBYDGBb1hBNx4wWydn7hp/tvYpBbVLUeOP7Fqn/vQm2NL1kWbgVWVbr4QaUAWhnP/MhwfI5DpmGBg==)
Content:
  Nonce:  1
  Fee:    2000 (gas limit: 1000, gas price: 2)
  Method: staking.AddEscrow
  Body:
    Account: oasis1qpl4axynedmdrrgrg7dpw3yxc4a8crevr5dkuksl
    Amount:  DOCS 208.0
Other info:
  Genesis document's hash: 0b9ddeaa80431ff3718f928e654e4b64cbd3f956d69d64e9c923e30766706a11

Closes #2871.

[codecov]

Codecov Report

Merging #3157 into master will increase coverage by 0.33%.
The diff coverage is 81.13%.

@@            Coverage Diff             @@
##           master    #3157      +/-   ##
==========================================
+ Coverage   68.75%   69.08%   +0.33%     
==========================================
  Files         383      383              
  Lines       37412    37445      +33     
==========================================
+ Hits        25721    25869     +148     
+ Misses       8414     8315      -99     
+ Partials     3277     3261      -16     

Impacted Files	Coverage Δ
go/consensus/api/api.go	38.09% <ø> (ø)
go/consensus/api/base.go	2.77% <0.00%> (-0.08%)	⬇️
go/consensus/api/grpc.go	68.42% <71.42%> (+0.12%)	⬆️
go/consensus/api/transaction/transaction.go	56.12% <78.94%> (+2.35%)	⬆️
go/consensus/tendermint/full/light.go	63.15% <100.00%> (+2.04%)	⬆️
go/consensus/tests/tester.go	97.97% <100.00%> (+0.17%)	⬆️
go/oasis-node/cmd/consensus/consensus.go	49.46% <100.00%> (+0.54%)	⬆️
go/oasis-node/cmd/stake/account.go	60.19% <100.00%> (+0.19%)	⬆️
go/runtime/host/sandbox/sandbox.go	67.28% <0.00%> (-10.04%)	⬇️
go/consensus/tendermint/api/api.go	80.64% <0.00%> (-8.61%)	⬇️
... and 43 more

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