Userswantedtheabilitytouse'x-pkg verrel'togetrelevantinformationabouttheircontainerimages.MethodparsesvaluesinDockerfile.Ifthereisanoverloadedvalueforarepo's version the methodusesthehigherprecedencevalue:(1)<repo_name>_VERSIONsupercededVERSIONIfthereisnoRELEASEvalueintheDockerfile,'verrel'fails.+addedchangessuggestedby@onosek
Added 'x-pkg verrel' for containers
Fixes: #547
Signed-off-by: jkunstle jkunstle@redhat.com