bundlerepo: handle changegroup induced phase movement in the associated method These movement comes from handling the changegroup part, so we keeps the code grouped. This will be important when handling more part (and more changegroup part in the future) This induce a small code duplication, but it does not looks terrible.

# name space package to host third party extensions
import pkgutil

__path__ = pkgutil.extend_path(__path__, __name__)