More descriptive errors with specific HTTP return codes #510
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Create a new error class that logical backends can use to specify more concrete error statuses to be returned to the HTTP stack in those cases. For non-changed cases, existing behavior is preserved.
This was inspired by #235 where double mounts caused a 500 error. This is because as you go back down the call chain, it doesn't know how to distinguish errors in client input and operation from backend errors.
This updates this specific case to now return a 409 Conflict instead of a 500 error for this specific case, but other cases can also be tackled as needed. There's at least one other ticket opened for the same type of issue.