Chart: Add global.image.registry.

[amarkevich]

What type of PR is this?

/kind feature

What this PR does / why we need it:

This PR adds a global.image.registry field to the chart which makes it possible to define the registry used for pulling images across the chart in a single place.

• squashed commits
• includes documentation
• adds unit tests

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: amarkevich
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[k8s-ci-robot]

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[k8s-ci-robot]

Hi @amarkevich. Thanks for your PR.

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