Transfer bench single stream mode (#531)

- Adding single stream mode
- Removing some unused env vars
- Adding output to CSV mode for p2p benchmark, topology listing modes

tools/TransferBench/README.md

@@ -0,0 +1,14 @@
+# TransferBench
+
+TransferBench is a simple utility capable of benchmarking simultaneous copies between user-specified devices (CPUs/GPUs).
+
+## Requirements
+
+1. ROCm stack installed on the system (HIP runtime)
+2. libnuma installed on system
+
+## Building
+  To build TransferBench:
+* `make`
+
+  If ROCm is installed in a folder other than `/opt/rocm/`, set ROCM_PATH appropriately