11. GetLocalChain Gets the specified local chain data of the hyper block

*Parameter: hid, super block number

chain_ num, sub chain number

*Example: http://127.0.0.1:8080/GetLocalChain?hid=1416&chain_num=1

*Return example:

{
  "block_chain":"unknown",
  "blocks":2,
  "chain_num":1,
  "concensus":"buddy",
  "difficulty":2
}