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

[ROCm/rccl commit: 0b2bfdd6d8]

projects/rccl/test/test_ReduceMultiProcess.hpp

@@ -101,7 +101,7 @@ namespace CorrectnessTests
                 return;
             }
 
-            Barrier barrier(rank, numDevices, std::atoi(getenv("NCCL_COMM_ID")));
+            Barrier barrier(rank, numDevices, StripPortNumberFromCommId(std::string(getenv("NCCL_COMM_ID"))));
 
             // Test each possible root
             for (int root = 0; root < numDevices; root++)