abci-cli: kvstore should store height

[erikgrinaker]

Summary

The abci-cli kvstore application does not appear to store the key height:

$ ./abci-cli kvstore
$ ./build/tendermint node
$ curl -s 'localhost:26657/broadcast_tx_commit?tx="key=value"'
$ curl -s 'localhost:26657/abci_query?data="key"'
{
  "jsonrpc": "2.0",
  "id": -1,
  "result": {
    "response": {
      "code": 0,
      "log": "exists",
      "info": "",
      "index": "0",
      "key": "a2V5",
      "value": "dmFsdWU=",
      "proof": null,
      "height": "0",
      "codespace": ""
    }
  }
}

Problem Definition

When testing, users expect the application to correctly return the height of the key. We should meet this expectation.

For Admin Use

• Not duplicate issue
• Appropriate labels applied
• Appropriate contributors tagged
• Contributor assigned/self-assigned