Refactor artifact cache exceptions.

Review Request #1261 - Created Oct. 31, 2014 and submitted

Information
David Turner
pants
89dcfd1...
Reviewers
pants-reviews
benjyw, davidt, ity, johanoskarsson
Presently, the artifact cache will treat any exception during the
insertion process as a non-fatal error.  But some errors should be
fatal -- any sort of misconfiguration, or an attempt to cache
nonexistent files, or an exception thrown while moving files around.
Also remove ArtifactCache.CacheError, as it was not clear when
to use ArtifactCache.CacheError and when to use ArtifactCacheError.

  
Ity Kaul
David Taylor
Benjy Weinberger
David Turner
Review request changed

Status: Closed (submitted)

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