scale in when store id match

[weekface]

When TiKV scale in/out over and over again, there will be many tombstone stores(different store ids) with the same podName:

    {
      "store": {
        "id": 81,
        "address": "demo-tikv-4.demo-tikv-peer.tidb.svc:20160",
        "state": 2,
        "labels": [
          {
            "key": "host",
            "value": "kube-node-3"
          }
        ],
        "state_name": "Tombstone"
      },
      "status": {
        "capacity": "112 GiB",
        "available": "37 GiB",
        "leader_weight": 1,
        "region_weight": 1,
        "region_score": 364760655.40200007,
        "start_ts": "2018-10-16T09:12:56Z",
        "last_heartbeat_ts": "2018-10-16T09:19:32.341413346Z",
        "uptime": "6m36.341413346s"
      }
    },
    {
      "store": {
        "id": 99,
        "address": "demo-tikv-4.demo-tikv-peer.tidb.svc:20160",
        "state": 2,
        "labels": [
          {
            "key": "host",
            "value": "kube-node-1"
          }
        ],
        "state_name": "Tombstone"
      },
      "status": {
        "capacity": "112 GiB",
        "available": "38 GiB",
        "leader_weight": 1,
        "region_weight": 1,
        "region_score": 317146632.2971641,
        "start_ts": "2018-10-16T09:21:27Z",
        "last_heartbeat_ts": "2018-10-16T09:27:31.180515186Z",
        "uptime": "6m4.180515186s"
      }
    }

So we should scale in only when the store id match also.

[weekface]

/run-e2e-tests

[weekface]

/run-e2e-tests

[tennix]

LGTM

[xiaojingchen]

LGTM