As an OTA engineer,
I would like to make sure the node in a single-node cluster is handled correctly in the upgrade-status command.

Context:
According to the discussion with the MCO team,
the node is in MCP/master but not worker.
This card is to make sure that the node are displayed that way too. My feeling is that the current code probably does the job already. In that case, we should add test coverage for the case to avoid regression in the future.

AC:

• The node is displayed in the master section in the output of the upgrade-status command.
• The node is NOT displayed in the worker section in the output of the upgrade-status command.
• A test case exists in https://github.com/openshift/oc/tree/master/pkg/cli/admin/upgrade/status/examples