Align Conditions with KEP-1623.

[jpeach]

KEP-1623 standardizes the structure of Conditions. Align to the standard
structure by adding the ObservedGeneration field, which API clients can
examine to test whether a Condition may be outdated.

https://github.com/kubernetes/enhancements/tree/master/keps/sig-api-machinery/1623-standardize-conditions

Signed-off-by: James Peach jpeach@vmware.com

[k8s-ci-robot]

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[jpeach]

Note that this does not re-order the fields, which matters for protobuf. Perhaps we should do that too?

[bowei]

/ok-to-test

[bowei]

/lgtm
/approve

[k8s-ci-robot]

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