fix code style in namesrv module

[PansonPanson]

I have read over the sourcecode of namesrv module，there are some code snippets need to be fixed.

2. grammatical error
   

3. 中文语句不通顺，中、英文逗号混用
   

4. redundant parameter
   

5. apache commons
   

6. for each
   

7. redundant code
   

8. try with resources
   

9. replace with append
   

[realJackSun]

LGFM