MCO-2031: OS Image Stream to install-config schema

[pablintino]

This change introduces the OS Image Stream concept to the install-config to facilitate day-zero stream selection. The change adds an optional global field that can be used to set the OS Image Stream to pick for all the pools and a per pool field to override it or to just set the stream in a specific pool.

The install-config, consumer later by the machine-config operator will be used by the operator to render the MCPs using the correct stream at bootstrap time.

[openshift-ci-robot]

@pablintino: This pull request references MCO-2031 which is a valid jira issue.

Warning: The referenced jira issue has an invalid target version for the target branch this PR targets: expected the story to target the "4.22.0" version, but no target version was set.

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In response to this:

This change introduces the OS Image Stream concept to the install-config to facilitate day-zero stream selection. The change adds an optional global field that can be used to set the OS Image Stream to pick for all the pools and a per pool field to override it or to just set the stream in a specific pool.

The install-config, consumer later by the machine-config operator will be used by the operator to render the MCPs using the correct stream at bootstrap time.

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[openshift-ci]

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