pantsbuild / pants / 4147

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Pass compression option along to temp local artifact caches.

Temp local artifact caches are used to create artifacts for remote
caches (when there is no local cache), so this allows compressed
artifacts on purely remote artifact caches.

Additionally, gzipping is now always turned on, although it can be set
to gzip at level 0, which does not compress.  Python's tarfile will
happily untar truncated or corrupted tars, but a corrupted gzip file
will have a bad checksum and will throw an exception.  This improves
reliability.

Testing Done:
https://travis-ci.org/pantsbuild/pants/builds/55119711 running (but the cache tests pass locally)

Reviewed at https://rbcommons.com/s/twitter/r/1955/

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12742 of 18446 relevant lines covered (69.08%)

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