fix通过环境变量传递时解析时的bug
fix通过环境变量传递时解析时的bug

AliyunContainerService/fluentd-pilot,bamboox/fluentd-pilot,bamboox/fluentd-pilot,AliyunContainerService/fluentd-pilot,AliyunContainerService/fluentd-pilot,bamboox/fluentd-pilot,AliyunContainerService/fluentd-pilot,bamboox/fluentd-pilot