Multiprocess unit test various fixes (#367)

* Re-enabling mp unit tests

* Fixing shared memory leak and other bugs related to shared mem for MP unit tests

* Revert 43bfbfc97bf9edbae1f386d461439091618ff8ed

* Further tightening up unlinks

* Moving test check macros to separate header file

* Tightening up shared memory unlinking for clique kernels, add munmap for host barrier for MP unit tests

* Updating new MP unit test

* Fixing mqueue bug

* Fixing memory leak in MP unit tests

test/test_ReduceScatterMultiProcess.hpp

@@ -116,7 +116,7 @@ namespace CorrectnessTests
                 return;
             }
 
-            Barrier barrier(rank, numDevices, std::atoi(getenv("NCCL_COMM_ID")));
+            Barrier barrier(rank, numDevices, StripPortNumberFromCommId(std::string(getenv("NCCL_COMM_ID"))));
 
             // Prepare input / output / expected results
             FillDatasetWithPattern(dataset, rank);