[issue24195] Add `Executor.filter` to concurrent.futures

[Nick Coghlan]

Nick Coghlan added the comment:

I vary between +0 and -0 for the addition of the concrete method.

When I'm at +0, the main rationale is that we *don't* have the "Where do we stop?" risk here that itertools faces, as we're just replicating the synchronous builtins.

When I'm at -0, the main rationale is that a recipe works with *any* version of Python that provides concurrent.futures (including any version of the PyPI backport), and is hence useful immediately, while a method would only work the version where we added it.

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<http://bugs.python.org/issue24195>
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