Make the dirutil test a proper unittest2 test.

Review Request #717 - Created July 22, 2014 and submitted

Information
Benjy Weinberger
pants
Reviewers
pants-reviews
jsirois
Use unittest asserts instead of the assert keyword, use setUp/tearDown etc.

Also make sure we start with a clean slate, in case other tests use
the atexit functionality.
Ran all unittests.
John Sirois
Benjy Weinberger
Review request changed

Status: Closed (submitted)

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