Add election run-dummy command

[Kubuxu]

> source scripts/dev/runAPI.bash
> runAPI MinerGetBaseInfo '["t02388", 163405, [{"/": "'"$(./lotus chain head | head -1)"'"}]]' | jq .
{
  "jsonrpc": "2.0",
  "result": {
    "MinerPower": "14156212207616",
    "NetworkPower": "681826195678953472",
    "Sectors": [
      {
        "SealProof": 3,
        "SectorNumber": 179,
        "SealedCID": {
          "/": "bagboea4b5abcas5opeafvoqljrxfwnfbo5amnyhg6cwzyt37rch5z4not3stserq"
        }
      }
    ],
    "WorkerKey": "f3rutut57upcbuzyq6si2xajhvr7d4u7exd7knqop4t6w3bpl57uqpdnfs72t2tyaz7vivwdvyc3bzvq2i37ma",
    "SectorSize": 34359738368,
    "PrevBeaconEntry": {
      "Round": 259249,
      "Data": "hQ687JZRrGV4U6QMrzac7I3evTOGnXAIY3bZagH4TLZI00+3KkclftPDtVoPbyEvFAwV474o/0G+EzoSnHf4I6Uh+uLupLBH0QVB5VdlHf0RyaBO8iYPHlNF5Hrmr0+6"
    },
    "BeaconEntries": null,
    "EligibleForMining": true
  },
  "id": 2
}
# take MinerPower and Network Power and run what is below with these numbers to simulate a day of mining
> ./lotus-shed election run-dummy  --miner-power 14156212207616 --network-power 681826195678953472 | head -2880 | grep true | wc -l
0