fix: include cleanupnodes() in transaction
As pointed out by Yuya, we need a transaction to make sure the state
before the call to cleanupnodes() is not observable.
Differential Revision: https://phab.mercurial-scm.org/D3823
# name space package to host third party extensions
from __future__ import absolute_import
import pkgutil
__path__ = pkgutil.extend_path(__path__, __name__)