Fix Jenkins compatibility with Review Board 3.0.
Review Request #10980 — Created March 27, 2020 and submitted
The new Jenkins integration is mostly fine running on top of old Review
Board versions, but there was one utility class that was renamed. This
change fixes it to use the correct import for both 3.0 and 4.0.
Was able to load the master branch of the rbintegrations extension on
Review Board 3.0.x.