def load(content)
      data = super(content)

      if data.is_a? AutoNetwork::Pool
        upgrade_from_version_1! data
      else
        data
      end
    end
def load(content)
      data = super(content)

      if data.is_a? AutoNetwork::Pool
        upgrade_from_version_1! data
      else
        data
      end
    end
Override the method inherited from `YAML::Store`. All `PStore` instances
 expect `load` to strictly return a `Hash`. This override allows us to
 perform on-the-fly upgrading of data loaded from old pool files and
 ensure the right structure is returned.

 @api private

 @param content [String] serialized YAML read from the pool file.
 @return [Hash]