- Bump version: 10.0.2 → 10.0.3

- Ensure we use a compatible docopt-ng version
  To ensure our trick to switch between docopt and docopt-ng works,
  we need to have a higher minimum version for docopt-ng where
  compatibility with the original docopt was restored.

- Fixed delta_root build
  The support for delta_root allows to build a delta container
  image from a given base container. Due to the refactoring of
  the kiwi code base using context managers no explicit deletion
  of instances happens anymore. This uncovered a weakness of
  the delta root code at the level of the overlay mount. At
  the time of the umount there are still active temporary
  mount handlers which keeps the mountpoint busy. In order to
  fix this properly also the PackageManager factory is now
  a context manager and the Repository factory received a
  cleanup method which is called when the PackageManager goes
  out of scope. This refactoring also fixes the busy state
  when building deltas

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