- make revision incrementation on rpkg approve work with --directory repos
- add new Directory attribute to PackageRevisionKey
  - and use it when matching PackageRevisions to filter out from the List operation
- package approval flow looks for previous copies of the package to
  determine new latest revision string (e.g. v1 -> v2)
  - this involves matching the package-for-approval's path attribute
    against existing packages' packageName attribute
  - however:
      - when a repo is registered using --directory to associate it with
        a subfolder in the upstream Git repo, packageName is deliberately trimmed
        of the directory attribute if it exists
      - but the path in the package-for-approval still has the directory part
      - so no existing packages can match to be counted as previous copies
      - therefore the revision can never increase beyond "v1" and the v1 tag is
        overwritten in Git with each new approval
      - this also results in previous package copies disappearing

- also for packages with slashes in the name