ZODB Components: Monkey patch astroid: Namespace package handling only...

ZODB Components: Monkey patch astroid: Namespace package handling only considered the top-level module.

This did not work with Shared.DC.ZRDB (Shared.DC namespace package) as it only
considers Shared to be a namespace package and not Shared.DC:
  No name 'ZRDB' in module 'Shared.DC' (no-name-in-module)