[Twisted-Python] deprecate using paths with trial

[Jean-Paul Calderone]

Hello,

Since trial has stopped adding the working directory to sys.path, it seems
very sensible to also stop accepting paths as a way to specify what tests
to run.  Instead, only package, module, class, or test method names should
be accepted.

Please add your thoughts (reasoned arguments, not +1s and -1s) to this
ticket:

    https://twistedmatrix.com/trac/ticket/9035

Thanks,
Jean-Paul
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