[Feature][doc] About Kerberos configuration document description

[BoYiZhang]

Currently, the dolphin scheduler supports Kerberos, but there is no official document about Kerberos

For example:

1. About the configuration of Kerberos in resource center HDFS

2. Hive configuration of data source

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目前dolphinscheduler 是支持kerberos, 但是现在官方还未提供关于kerberos的文档说明. 比如:

1. 资源中心: 如何 hdfs配置kerberos
2. 数据源 : hive 如何 配置kerberos