message: Added CP specific id format
diff: "type": "object",
  "properties": {
  "id": {
  - "$ref": "common.json#/definitions/id"
  + "type": "string",
  + "sanitize": "mongo",
  + "pattern": "^[a-f0-9]{64}$"
  },
  "chargingStationID": {
  "$ref": "chargingstation.json#/definitions/id"
  