revert: always display hunks reversed when reverting to parent
When reverting to the parent of working directory, operation is "discard" so
we want hunks to be presented in the same order as the diff (i.e. "reversed").
So we do not query the experimental.revertalternateinteractivemode option in
this case and always set "reversehunks" to True.
Run Mercurial tests with Vagrant:
$ vagrant up
$ vagrant ssh -c ./run-tests.sh