improve log for image pre-building during test setup
improve log for image pre-building during test setup

nuest/o2r-muncher,nuest/o2r-muncher,nuest/o2r-muncher,o2r-project/o2r-muncher,nuest/o2r-muncher,o2r-project/o2r-muncher,o2r-project/o2r-muncher,nuest/o2r-muncher,o2r-project/o2r-muncher,o2r-project/o2r-muncher