listkeys - convert uids and gids

Signed-off-by: Serge Hallyn <serge.hallyn@ubuntu.com>
convert_directory_contents: fix bad reuse of nih_local

Also fix endless loop walking keys[i].

Signed-off-by: Serge Hallyn <serge.hallyn@ubuntu.com>
update comment, we're done

Signed-off-by: Serge Hallyn <serge.hallyn@ubuntu.com>