Automatic merge from submit-queue (batch tested with PRs 45316, 45341)
Move hollow-node's initContainer from annotation to field
In 1.6, we have moved init containers spec from beta annotation to field. Updating this in kubemark hollow-node.
This should solve issues with setting of default fields (like ImagePullPolicy) in the container spec for older versions of apiservers too (as annotation->field change has been cherry picked for older releases too). We noticed this issue in https://github.com/kubernetes/kubernetes/issues/45290 where an old apiserver apparently wasn't setting default ImagePullPolicy for container spec inside annotations.
cc @wojtek-t @gmarek @gamename
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