BFT Block Replication and Block Signature Verification

[Param-S]

Refer #48 for complete details

Workitems:

• [ ] Story: Define and implement a generic BFT Block Replication Module

  • [ ] Implement a new interface BlockFetcher with source suspicious logic and reshuffling
  • [ ] Implement a block attestation service
  • [ ] Implement a block signature verification

• [ ] Story: Update peer module to use new block replication module

  • [ ] Update peer block deliver client to use new common block replication module

• [ ] Story: Update orderer module to use new block replication module

  • [ ] Update orderer block replicator client to use new common block replication module

• [ ] Story: Write Unit & Integration Tests

  • [ ] Add new Integration tests