Mainnet truffle migrations

[cuongdo]

Checklist:

• [x] Code contains relevant tests for the problem you are solving
• [x] Ensure all new and existing tests pass
• [x] Update any relevant READMEs and docs

Description:

This should make us ready for mainnet deployment of the tokens. Added in this PR are:

• New migration to transfer OGN, marketplace contract ownership, and token contract ownership to mainnet multi-sig
• New mainnet verification migration: this doesn't migrate anything but is a useful set of automated, gas-free tests
• A new SIMULATE_MAINNET environment variable to try truffle migrations in "mainnet mode" on your local blockchain
  • e.g. SIMULATE_MAINNET=1 npx truffle migrate --reset
• Fix for a buggy error message encountered in a Rinkeby deployment
• Add multi-sig wallets to token CLI owner whitelist

[cuongdo]

cc @joshfraser

Please pay extra attention to the mainnet addresses. Thanks!