Nik Everett d0be96df7b Clean up snapshots after each REST test
The only repository we can be sure is safe to clean is `fs` so we clean
any snapshots in those repositories after each test. Other repositories
like url and azure tend to throw exceptions rather than let us fetch
their contents during the REST test. So we clean what we can....

Closes #18159
2016-09-15 14:49:11 -04:00
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