"Verbose" output for fully_qualified_image check

[ThelonKarrde]

As suggestion, add verbose mode with flag. As example: In fully_qualified_image check, without Verbose mode: Use fully qualified image for container 'prometheus-node-exporter' With Verbose mode: Use fully qualified image for container 'prometheus-node-exporter', linted image name be docker name check: $correct_image_name. In script any way you call ParseAnyReference function, why not to share the output of this function?

[varshavaradarajan]

How about just changing the message for the fully-qualified image check to Use fully qualified image for container 'prometheus-node-exporter', linted image name be docker name check: $correct_image_name ? I don't see a need for a verbose mode to show a different message as its not applicable to all checks? If the message from any other check is vague, we can alter that to be more clear.

cc @adamwg

[adamwg]

A verbose mode is an interesting idea for the future - there are many checks where we could expand messages and even provide fix suggestions. But I agree, for this specific instance just adding the suggested image name to the output would be appropriate.

Slightly shorter suggested text:

Use fully qualified image name '%s' for container '%s'.