Add initialization actions to protocol deployment script

[Tomás Migone]

The following actions need to be performed manually when deploying the protocol:

• Deployer renounce minter (GraphToken.renounceMinter)
• Set subgraph availability oracle (RewardsManager.setSubgraphAvailabilityOracle)
• Set AssetHolder (Staking.setAssetHolder)
• Set Pause Guardian (Controller.setPauseGuardian)
• Transfer contract ownership to governor
  • Controller
  • GraphProxyAdmin
  • GraphToken
  • SubgraphNFT
• Transfer contract ownership to allocation exchange owner
  • AllocationExchange

These could be done automatically by incorporating the required parameters into the config file graph.<network>.yml

[Tomás Migone]

Fixed in #631