Binding generator v2 - namespace fix #1

Binding generator v2 - namespace fix #1

- put builders to dto package
- add test yang
- fix merge conflicts
TODO
     #2 - fix namespace of data type in grouping namespace

        - add "Grouping" suffix for grouping type name
        & "Data" for data type name

     #3 - support generate type from uses grouping

Change-Id: Iac9fb8f76c8308860f166019d47b8849fb41f95e
ChangeId: I08aa15ebdc6ebefb5aa38869d9fb04bfe9664ee9
Signed-off-by: Jie Han <han.jie@zte.com.cn>
(cherry picked from commit 8d45e9e792a02e5aba4cef141f4df3955b21a378)