SST RDMA tests are not using RDMA DP

Created by: keichi

I'm not 100% sure, but I think the SST RDMA tests are not using the RDMA DP. Currently, if RDMA-capable interfaces are unavailable, the RDMA DP doesn’t try to use the generic sockets fabric provider and gives up (unless a specific interface is forced via FABRIC_IFACE or DataInterface). Therefore, SST always falls back to EVPath DP on a system without RDMA. I am not sure about the CI servers, but at least on my laptop, the RDMA tests (e.g. HeatTransfer.SST.BP.RDMA.MxN ) are actually using EVPath.