update to the ping_docker_registry() routine to handle translating docker.io to the actual dockerhub registry url. Fixes #52.
update to the ping_docker_registry() routine to handle translating docker.io to the actual dockerhub registry url. Fixes #52.

Signed-off-by: Daniel Nurmi <fdebf2174dd81b443340a1b87c16a0d53605a1f3@anchore.com>

anchore/anchore-engine,anchore/anchore-engine,anchore/anchore-engine