Merge branch 'jc/blame-ignore-fix'

"git blame --ignore-rev/--ignore-revs-file" failed to validate their input are valid revision, and failed to take into account that the user may want to give an annotated tag instead of a commit, which has been corrected. * jc/blame-ignore-fix: blame: validate and peel the object names on the ignore list t8013: minimum preparatory clean-up