Fix false-positive for unused-import on class keyword arguments

[cdce8p]

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Description

Fix a false-positive the occurs after pylint-dev/astroid#919 is merged.

from const import DOMAIN_2  # would be (falsely) flagged as unused-import

class Child:
    def __init_subclass__(cls, **kwargs):
        pass
class Parent_2(Child, domain=DOMAIN_2):
    DOMAIN_2 = DOMAIN_2

Furthermore, I added some test cases for #3202.

This MR depends on pylint-dev/astroid#919

Type of Changes

	Type
✓	🐛 Bug fix

Related Issue

Closes #3202

[Pierre-Sassoulas]

Great work !

[coveralls]

Coverage increased (+0.001%) to 91.429% when pulling e97a975 on cdce8p:fix-unused-import into 12acc43 on PyCQA:master.

[cdce8p]

@Pierre-Sassoulas This MR is ready now. I've included the astroid version bump to 2.5.2 in the last commit.

[Pierre-Sassoulas]

👍

[KapJI]

@cdce8p Huge thanks for driving this fix!