message: Allowing maxPingTime to be set to 0
  It's useful to be able to disable the ping for debugging,
  but the code currently rejects the ServerInfo message if
  the maxPingTime is set to 0.
diff: "MaxPingTime": {
  "description": "Maximum time (in milliseconds) the server will wait between ping messages from client before shutting down.",
  "type": "integer",
  - "minimum": 1
  + "minimum": 0
  }
  },
  "minProperties": 7,
  