Remove todo notes for Storage tests and refactoring

This patch removes two items from the todo list:
- Check timing in Storage tests:  Since we introduced the two seconds
  timeout, no test failed due to timing issues.  There is nothing we can
  do to check it more precisely, so we just have to live with it for
  now.
- Consider restructuring `device::StorageStatus`:  We already have
  structs for the volume status and firmware version.  There is no need
  to extract more fields.

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