0.6.0

Upgrade notes:

• Renamed the data_volume variable to default_data_volume. The data disk config now represent default disk configuration.
  This is overridable at node level if required.
  For existing code change as follows:

    data_volume = {
      # ...
    }

  To new code

    default_data_volume = {
      # ...
    }

Breaking Changes:

• Renamed the data_volume variable as default_data_volume. The new configuration represent default data disk config which will be used by all the nodes.
  This can be overridden at node level by providing selectively different values for the values. (See the input variable documents)

Full Changelog: v0.5.0...v0.6.0