Tpetra::BlockMultiVector doImport needs to implement "new" DistObject interface
Created by: ambrad
In the BCRS MVP, BMV::doImport is called. In turn, DistObject::doTransferOld is called. This is causing a large slowdown in GPU runs. This issue will track solving this problem.
Original title: "Modify Tpetra::BlockMultiVector so that useNewInterface() can be true"