refactor ctl.py with respect to MPP module

[zhjwpku]

This is the last step of abstract MPP handler feature.

[coveralls]

Pull Request Test Coverage Report for Build 8249924203

Warning: This coverage report may be inaccurate.

This pull request's base commit is no longer the HEAD commit of its target branch. This means it includes changes from outside the original pull request, including, potentially, unrelated coverage changes.

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Details

• 38 of 38 (100.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 99.861%

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Totals
Change from base Build 8075643811:	0.0%
Covered Lines:	13616
Relevant Lines:	13635

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💛 - Coveralls