phase-shelve: correct unicode string to honor 'shelve.store=internal'
In the case of strip-based shelves, there should be no hidden commit found.
That's because shelve.store=internal is necessary but not sufficient to enable
phase-based shelves; internal-phase must also be set.
# name space package to host third party extensions
import pkgutil
__path__ = pkgutil.extend_path(__path__, __name__)