* Make all integration tests start with an empty remote
* Add an -individual flag so this can be a different bucket/container/directory
* Fix up tests after changing the hashers
* Add sha1sum test
* Make directory checking in tests sleep more to fix acd inconsistencies
* Factor integration tests to make more maintainable
* Ensure remote writes have a fstest.CheckItems() before use
* this fixes eventual consistency on the directory listings later
* Call fs.Stats.ResetCounters() before every fs.Sync()
Note that the tests shouldn't be run concurrently as fs.Config is global state.
eda4130703