Node Manager: A Few Minor UX Enhancements

[jacderida]

• e247ef7 fix: apply interval only to non-running nodes

  The node manager start command has an --interval argument that can be used as a time-based delay
  between starting nodes. The problem is, the interval would apply to nodes that were already running,
  which is a waste of time. Now the interval is not applied to those nodes.

• be04805 chore: use better banners

  These new banners for the node manager are a bit more eye catching, and also fix the incorrect sizes
  of the previous banners in the status --details command.

• 8a0b296 chore: output reward balance in status --json cmd

  This was a community feedback request.

  The reward balance is now output as part of the status --json command, which involved adding the
  field to the information tracked by the registry.

  BREAKING CHANGE: previously written registry files will not have this new field and so won't
  deserialize correctly.

• 5a32365 tests: use node registry for status

  Rather than parsing the text-based output of the status command, we now switch to using status --json, which we can then serialize into the NodeRegistry, and any status can be obtained from
  there.

  This prevents breakage when the text output changes.

• 5e801a0 fix: change reward balance to optional

  Due to it being possible to run the node manager status command before any services have been
  started, the reward balance should be an optional value, since the node's wallet has not been
  created before it starts.

• 94ef20e test: disable node man integration tests

  These tests are no longer passing and it's not completely clear why. In any case, I think they need
  to be a bit more isolated, and operate on their own local network.

  At the moment there is not enough time to address that.

Description

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