registries.conf: remove references on v1
registries.conf: remove references on v1

Version 2 of the registries.conf has been used long enough in the wild
to consider it stable.  Hence, remove the references in the
registries.conf file to the previous version in hope to increase v2
adoption.

Signed-off-by: Valentin Rothberg <c8d7c67387706f1534261b1aba83f5c355c00ff5@redhat.com>

containers/image,containers/image