Yuto Takano fc1e9ffcb2 Use Abstract Base Classes to ensure Problem is not instantiated ...

- Problem() is a parent abstract class that should only be used for
  subclassing.
- With the help of ABC, implement abstract methods that force
  subclasses to implement quiet and verbose outputs.
- The repeated logic of "if self.quiet" is consolidated in Problem.

Signed-off-by: Yuto Takano <yuto.takano@arm.com>

2021-08-23 13:54:56 +01:00

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