Some tests create their own ReplSetTest and pass it in to be used by a RollbackTest instance. If they don't enable the 'setSmallOplogGetMoreMaxTimeMS' failpoint on replica set nodes, it can make RollbackTest execution very slow, due to the problem described in SERVER-45400. We should have these tests enable this failpoint and/or require that it is enabled for a ReplSetTest that is passed in to RollbackTest.