Performance fix for consolidated classpath

Review Request #4184 — Created Aug. 23, 2016 and submitted — Latest diff uploaded

molsen
pants
3806
pants-reviews
mateor, nhoward_tw, patricklaw, stuhood, zundel
Previously we fetched the classpath entries for each target which was very expensive.  This change fetches them upfront.

Prior to change:

23.419 main:consolidate-classpath
23.414 main:consolidate-classpath:consolidate-classpath

After change:

1.344 main:consolidate-classpath
1.340 main:consolidate-classpath:consolidate-classpath

CI pending: https://travis-ci.org/pantsbuild/pants/builds/154601783

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