fix: introduce additional fall back if the user cache directory can't be used #215
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PeterSchafer
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This PR introduces an additional fallback cache directory to increase fault tolerance of the Snyk CLI. When the first cache directory can't be used it'll try the tmp dir and later only the current dir.
This shall make the CLI function in environments that are very limited in their permissions.
Implementation detail:
I replaced a handwritten mock by a generated mock to easier test, which is why there are a couple of changes in the tests.