support the config file in hdfs

[henry202108]

Exchange can support the jar in hdfs to run but can not supoort the config file in hdfs,it will fail and return the error :
Exception in thread "main" java.lang.IllegalArgumentException: hdfs:/192.168.15.2:9000/tn/app_bs_cli.conf not exist
at com.vesoft.exchange.common.config.Configs$.parse(Configs.scala:260)
It should be supported by putting the config file in hdfs.

[Nicole00]

Thanks for proposing this requirement. I want to know in what scenarios do you need to put the configuration file on hdfs