[Discuss] About Clean Code Plan

[LiZhenNet]

Now ,Dubbo has 167 contributors , 3125 commits. There are a lot of unused
methods ,unused logic , nonstandard naming  in the code. And there are some
code that can use the new features of java to make the code more concise
and understandable. like Lambda , Diamond Operator and so on.These are easy
to find and fixed because of the tips of the idea .We should do it before
completing the incubation.