*: rename payload -> image

[steveej]

This aids in the the process of introducing consistency about the image term in
the automatic upgrades context.

Relates to openshift/api#175.

/cc @smarterclayton

[steveej]

Need to self-review this tomorrow.

/hold

[smarterclayton]

lgtm at a high level

[steveej]

Found a few capitalization bugs

[steveej]

@smarterclayton I looked over this again and found a few capitalization bugs, the semantics sound OK to me. PTAL (your /lgtm was missing a / to be effective

/hold cancel

[smarterclayton]

/lgtm

Was intentional, figured it needed a bit more of a look.

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[crawford]

I know I'm showing up late, but I don't like this change. Are all consumers of Cincinnati going to use images to provide updates? I used the generic term in order to remain flexible to other use-cases.

[lucab]

@crawford indeed, when sitting on top of rpm-ostree this field would carry a refs-id or a commit-id or a URL. I find the original term more appropriate too.

However openshift/cluster-version-operator#98 preemptively changed the protocol on client side, and somehow the two pieces have to be consistent.