BFT Block Puller: in orderer

[tock-ibm]

Use BFT block deliverer relevant components in the orderer chain + follower

• Block receiver

• Censorship monitor

• Config updated dynamically

• Orderer source addresses updated dynamically

• [x] Detect the self endpoint

• [ ] Allow the orderer to choose a block-replication-policy: between a naive scheme (existing) and the BFT resistant scheme

• [ ] Allow the BFTDeliverer to skip the self endpoint when pulling blocks

• [ ] Implement the BFT resistant scheme into a new BFT synchronizer

• [ ] Target height selection: (1) simple (based on height by endpoints and F), (2) optimistic (based on verifying the last block from each orderer, selecting max height from those that verify).