Delete a problematic test case

Summary: This test case is currently failing with various different versions of puppet-lint. I was considering fixing this test case, but I feel that we have more than enough test cases for ArcanistPuppetLintLinter anyway. Since this is an ArcanistExternalLinter, we only really need to test that the bindings are working as expected (rather than the linter functionality).

Test Plan: arc unit

Reviewers: epriestley, Blessed Reviewers

Reviewed By: epriestley, Blessed Reviewers

Subscribers: Korvin, epriestley

Differential Revision: https://secure.phabricator.com/D11313