changelog: also monitor `00changelog.n` when applicable (
issue6554)
This let the locarepo's file cache detect outdated nodemap docket and reload the
changelog after `localrepo.invalidate` when applicable.
Differential Revision: https://phab.mercurial-scm.org/D11482
To run the tests, do:
cd tests/
python run-tests.py
See https://mercurial-scm.org/wiki/WritingTests for
more information on writing tests.