[issue24195] Add `Executor.filter`

[Ethan Furman]

Ethan Furman added the comment:

Updated the tests (had to use real defs, not lambdas, and the expected results for filter_exception weren't right).

Tests pass.

Get some docs written!  :)

(More reviews would also be good. ;)

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Added file: http://bugs.python.org/file39377/issue24195.stoneleaf.01.patch

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