Adding blank line between comment tag and package name in doc.go. So
that the comment tags such as '+k8s:deepcopy-gen=package' do not show up
in GoDoc.
This commit is an initial pass at providing an admission API group.
The API group is required by the webhook admission controller being
developed as part of https://github.com/kubernetes/community/pull/132
and could be used more as that proposal comes to fruition.