HIVE-3020: add MachinePool adoption documentation.

[huangmingxia]

Add MachinePool adoption documentation.

Changes

• Add documentation for automatic metadata.json generation via retrofit code
• Add MachinePool adoption procedure documentation

[openshift-ci-robot]

@huangmingxia: This pull request references HIVE-3020 which is a valid jira issue.

Details

In response to this:

Add MachinePool adoption documentation.

Changes

• Add documentation for automatic metadata.json generation via retrofit code
• Add MachinePool adoption procedure documentation

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[openshift-ci]

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[huangmingxia]

/hold

[huangmingxia]

/unhold

[huangmingxia]

/test periodic-images

[huangmingxia]

/test periodic-images

[huangmingxia]

/test periodic-images

[huangmingxia]

/test periodic-images

[huangmingxia]

/test periodic-images

[openshift-ci]

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[huangmingxia]

Hi @2uasimojo @suhanime @dlom Could you please help review this doc update when you have time? Thank you!