Merge branch 'nd/fix-directory-attrs-off-by-one' into maint

The attribute mechanism didn't allow limiting attributes to be applied to only a single directory itself with "path/" like the exclude mechanism does. The initial implementation of this that was merged to 'maint' and 1.8.1.1 had severe performance degradations. * nd/fix-directory-attrs-off-by-one: attr: avoid calling find_basename() twice per path attr: fix off-by-one directory component length calculation