the apiextensions type is internal

this is used in OLM to handle csvs from a catalog without parsing
them fully (and abstract over changes in underlying types)

this is not used in operator-registry anymore, and will be replaced
by the validation library

Bump to kube 1.16

Add migration proposal

pkg/registry: use v1beta1.CustomResourceDefinition, as the apiextensions type is internal

Allows code reuse throughout operator-registry.

This implements "Populate" for writing bundle data to a configmap. Both
subdirectories manifests and metadata are parsed for files to be stored
in the configmap.

Also implements a function for deploying the bundle image via a job.

This command serves the manifest data from an image bundle into a
configmap. The naming should be fairly temporary as this functionality
will very shortly be refactored into the upcoming CLI changes for
incorporating everything into one binary.

Essentially what is produced by `ginkgo bootstrap`, but without using
dot-imports. The package name is intentionally chosen to be outside of
the code under test in order to encourage not reaching into the
internals.

The image-bundle directory contains files for the data inside a bundle
image in addition to buildling both the bundle and init container
images.