local plugin-list and early conftest opt-out

[pytestbot]

Originally reported by: Ronny Pfannschmidt (BitBucket: RonnyPfannschmidt, GitHub: RonnyPfannschmidt)

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ini configuration should support listing local plugins while opting out of early conftest consideration

this would allow more controll over cli arguments

as additional extension it should allow to list global plugins for early initalizatoon, maybe with a marker if the global plugins are optional

[pytest]
plugins =
  pytest_cov? # enable coverage early if we have it
  testing/pytest_plugin.py #explicit filename
  myproject.testsupport # import, could also be used to add other tests

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• Bitbucket: https://bitbucket.org/pytest-dev/pytest/issue/152

[RonnyPfannschmidt]

closing this one as unspecific/mega-long-term