resourceread: Add images

[cgwalters]

I want to read an imagestream from a file in the MCO, for the
same reason the CVO is doing. This code could replace the
bits in the CVO for it.

[openshift-bot]

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/lifecycle stale

[cgwalters]

Ping, any reviewers here?

[deads2k]

/lgtm
/approve

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: cgwalters, deads2k

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[openshift-ci]

@cgwalters: all tests passed!

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