We want to add new logic into bgsync.cpp to fall back onto the no_uuid rollback algorithm if we are in featureCompatibilityVersion 3.4 instead of 3.6. This is needed because UUID's are a feature included in 3.6 and not 3.4. Thus, if the featureCompatibilityVersion of the cluster is not 3.6, we want to ensure that the no_uuid rollback algorithm is used to prevent compatibility issues.