What this PR does / why we need it:
There are some code problems in Mapper-Framework, and there are also some areas that can be simplified. Make the changes here.
Which issue(s) this PR fixes:
Needs approval from an approver in each of these files:
- ~~[staging/src/github.com/kubeedge/mapper-framework/OWNERS](https://github.com/kubeedge/kubeedge/blob/master/staging/src/github.com/kubeedge/mapper-framework/OWNERS)~~ [fisherxu]
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What type of PR is this? /kind bug
What this PR does / why we need it: There are some code problems in Mapper-Framework, and there are also some areas that can be simplified. Make the changes here. Which issue(s) this PR fixes:
Fixes #
Special notes for your reviewer:
Does this PR introduce a user-facing change?: