message: Fixed connection-create id type
diff: "type": "object",
  "properties": {
  "connectorId": {
  - "$ref": "chargingstation.json#/definitions/connector/properties/connectorId"
  + "type": "string",
  + "sanitize": "mongo"
  },
  "userId": {
  "$ref": "user.json#/definitions/id"
  