Automatic merge from submit-queue (batch tested with PRs 46239, 46627, 46346, 46388, 46524)

move labels to components which own the APIs

During the apimachinery split in 1.6, we accidentally moved several label APIs into apimachinery.  They don't belong there, since the individual APIs are not general machinery concerns, but instead are the concern of particular components: most commonly the kubelet.  This pull moves the labels into their owning components and out of API machinery.

@kubernetes/sig-api-machinery-misc @kubernetes/api-reviewers @kubernetes/api-approvers 
@derekwaynecarr  since most of these are related to the kubelet