tests: update output for new branch cache messsages from Mercurial
This makes tests pass again after Mercurial commit c7d236b55a3e (py3:
fix formatting of branchmap log messages with repo.filtername=None,
2019-07-14).
CORE-TEST-OUTPUT-UPDATE: c7d236b55a3e
syntax: re
/figures/[^/]+\.png$
^html/
\.pyc$
~$
\.swp$
\.orig$
\.rej$
^tests/.*\.err$
^tests/easy_run.sh$
^build/
^dist/
^MANIFEST$
^docs/tutorials/.*\.rst$
\.ico$
tests/\.testtimes
^docs/training/graphs/
^docs/training/html/
^docs/training/index.html
^docs/training/graphviz-images/
^docs/training/img/
^docs/training/output/
^docs/training/pandocfilters/