output of yarn start:contract is disorganized, not checked

[dckc]

• excessively verbose
• lacks timestamps, making things like yarn start:contract fails: Proposal rejected at propose-start-contract.sh #44 hard to diagnose
• silent failures: silent failure on insufficient IST when installing bundles #60

For steps like voting, the output should be concise: timestamp, block height, hash, proposal number, YES should fit on one line.

using json-lines uniformly can be a big help.