Remove registry v2 code path

As this feature requires more testing it is much safter to get the
underlying changes into the codebase first then enable the feature in
another release after proper testing and verification can be done.

Signed-off-by: Michael Crosby <crosbymichael@gmail.com>
Merge pull request #8391 from crosbymichael/disable-v2-registry

Remove registry v2 code path