bundle2: rename the _canusebundle2 method to _forcebundle1...
bundle2: rename the _canusebundle2 method to _forcebundle1
We rename and invert the logic of the _canusebundle2 utility. The idea here is
that we need to have a way to enforce the use of bundle1 in the tests. The
Mercurial philosophy is to try to use the best method available. Currently that
best method is bundle2, but this might change in the future. Therefore expressing
"do not use bundle2" is a loosy way to say "use bundle 1" and will likely create
issue in the future. As the config option will be explicitly about bundle1, we
rename the function beforehand to align with this. This will make the life of a
future developer working on bundle3 easier.