Chnage LookupRemoteImage to return error
This commit is patch for following comment
// TODO: This method should return the errors instead of masking them and returning false

Signed-off-by: Daehyeok Mun <daehyeok@gmail.com>
Signed-off-by: Michael Crosby <crosbymichael@gmail.com>
Merge pull request #9701 from crosbymichael/registry-lookup-image

Change LookupRemoteImage to return error