Refactor the directory of dlrover.

[workingloong]

Now, the directory name of dlrover is confused. The folders under dlrover are dlrover/python, dlrover/client, dlrover/trainer, dlrover/go, dlrover/proto. The dlrover/go and dlrover/python are named by the programming language, but the dlrover/trainer, dlrover/proto and dlrover/client are named by the function module. What's more, the dlrover folder is used to build a python package but the dlrover/go is not packaged in the dlrover wheel.

The folders can be re-organized the following structure.

|-dlrover
   |-client
   |-proto
   |-trainer
   |-master
   |-agent
|-go
   |-brain
   |-elasticjob
   |-master

[bobsongplus]

Does have a plan to implement brain and master in Golang? I found the code of brain and master is on early stage.

[workingloong]

Yes, I’ll submit the refactor design of master soon. But, we need to discuss whether to keep the brain which is not commonly used.