[python-ng] A task to select a python interpreter.

Review Request #4346 — Created Nov. 1, 2016 and submitted — Latest diff uploaded

benjyw
pants
pants-reviews
jsirois
Places the resulting interpreter in products for future python-ng
tasks to consume.

Also made a few changes to the old PythonTask, namely moving
some logic that really belonged in InterpreterCache to there
(so that the new task can use it), and removing some unused methods.

CI passes: https://travis-ci.org/pantsbuild/pants/builds/173577121

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