Use file tags to generate conversions
Use file tags to generate conversions

This drives conversion generation from file tags like:
  // +conversion-gen=k8s.io/my/internal/version
.. rather than hardcoded lists of packages.

The only net change in generated code can be explained as correct.  Previously
it didn't know that conversion was available.

kubernetes/community,pwittrock/community,bgrant0607/community,kubernetes/community,bgrant0607/community,pwittrock/community,kubernetes/community