This change affects the way that secret, configmap, downwardAPI and projected
volumes (which all use the same underlying code) implement their data update
functionality.

* Instead of creating a subdirectory hierarchy that itself
  will contain symlinks to each actual data file, create only
  symlinks to items in the root of the volume, whether they
  be files or directories.
* Rather than comparing the user-visible data directory
  to see if an update is needed, compare with the current
  version of the data directory.
* Fix data dir timestamp format year
* Create ..data symlink even when a data volume has no data so
  consumers can have simplified update watch logic.