Improve logging for missing tags (#536)
Improve logging for missing tags (#536)

If a registry is missing the image with the specified tag, the logging
does not indicate what the error could be.  Instead, make a suggestion
about the error and print out the request body.
rthallisey/ansible-service-broker,johnkim76/ansible-service-broker,johnkim76/ansible-service-broker,rthallisey/ansible-service-broker,eriknelson/ansible-service-broker,johnkim76/ansible-service-broker,eriknelson/ansible-service-broker,eriknelson/ansible-service-broker,rthallisey/ansible-service-broker