*args and **kwargs are reported as unused even if added to ignored-argument-names

[karyon]

Steps to reproduce

given this function:

def frob(arg, *args, **kwargs):
    pass

and this setting

ignored-argument-names=arg|args|kwargs

pylint will report

unused-argument / Unused argument 'args'
unused-argument / Unused argument 'kwargs'

which i wouldn't expect. weirdly, adding them to dummy-variables-rgx actually silences the warning.

using pylint 1.9.2

[brycepg]

Thanks for the report!