Stashcache-tester

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* Check MD5sum of test file
* Correctly report failed downloads
* Use new module stashcp/3.0

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* Adding the ``maxdays`` to :py:class:`stashcache_tester.output.githubOutput.GithubOutput` to limit the number of days to keep data.

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* Add caching site to the output data for :py:class:`stashcache_tester.output.githubOutput.GithubOutput`

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* Fix bug in post site processing when certain output exists but is blank.

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* Reconfigure data layout for github output plugin. It will now write to a single file, ``data.json``.

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* Remove host key check from the github output type.
* Add condition to remove jobs which have had shadow exceptions more than 5 times.