tests: show that hgweb contains hidden revisions in /filelog/ view
Note that these entries contain the summary line of the hidden commit,
which is a bit a privacy issue to display. Also note that the links
from the entries take you to a page that says:
An error occurred while processing your request:
filtered revision '
2d32257e1109' (not in 'served' subset)
Differential Revision: https://phab.mercurial-scm.org/D3121
Run Mercurial tests with Vagrant:
$ vagrant up
$ vagrant ssh -c ./run-tests.sh