Add original_nvr and rebuilt_nvr to ArtifactBuild.
Change the ErrataAdvisoryRPMSSigned handler to set build.name to name part of NVR, build.original_nvr to NVR and to generate build.rebuilt_nvr using new utils.get_rebuilt_nvr() method.
Properly set the NVR of parent images to build.rebuilt_nvr instead of using
original NVR.
original_nvrandrebuilt_nvrto ArtifactBuild.build.nameto name part of NVR,build.original_nvrto NVR and to generatebuild.rebuilt_nvrusing newutils.get_rebuilt_nvr()method.build.rebuilt_nvrinstead of usingoriginal NVR.