Allow import redirections
Allow import redirections

When we move modules out of namespace packages we set up redirects to
import the new module under the old name. Python's import machinery
doesn't detect those things as modules, and the names don't show up in
sys.modules. However, if we look at what we actually got when we did the
import we can see that it is a module.

Change-Id: I4b42d081965b6d898b178cbe9232b47cfed17d8a

zancas/hacking,zancas/hacking,openstack-dev/hacking,openstack-dev/hacking