Add support for __init_subclass in Task metaclass. #3154
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Description
Since python 3.6 and PEP 487 metaclasses must pass kwargs to super. Otherwise the init_subclass hook fails.
Motivation and Context
For a detailed discussion regarding the same issue in abc see:
https://bugs.python.org/issue29581
And the patch for the issue above:
python/cpython@6fb12b5
Have you tested this? If so, how?
Unit test added