Add Mapped field to Image struct

[dinhxuanvu]

The Mapped key will hold information regarding mapped images that can be used later for openshift-tests images cmd.

See #openshift/kubernetes#2447

[openshift-ci]

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[openshift-ci]

Hi @dinhxuanvu. Thanks for your PR.

I'm waiting for a openshift-eng member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[dinhxuanvu]

Related to openshift/kubernetes#2447
@bertinatto @smg247 PTAL

[bertinatto]

In theory external binaries could return values with deeply-nested images, but I believe it's fine because we're only interested in the first level. The other options is to make it flat, but I can go either way.

@smg247 @stbenjam thoughts?

[dinhxuanvu]

Just to elaborate on what Fabio said. If the deeply-nested struct is not acceptable, we can do flat struct like this:

type Image struct {
	Index    int         `json:"index"`
	Registry string      `json:"registry"`
	Name     string      `json:"name"`
	Version  string      `json:"version"`
	Mapped   MappedImage `json:"mapped,omitempty"`
}

type MappedImage struct {
	Index    int    `json:"index"`
	Registry string `json:"registry"`
	Name     string `json:"name"`
	Version  string `json:"version"`
}