Enable DVCS by default.
Review Request #10390 — Created Jan. 24, 2019 and submitted
The DVCS feature is now pretty stable, and we want to make sure that 4.0
ships with it turned on so that users can play with it and run it
through its paces. This change turns the DVCS feature flag on.
Checked locally that the DVCS UI was showing up with this enabled.
Unit tests pass.