* Adding timeout functionality/EnvVar to TestBed
* updating timeout unit to microseconds
Signed-off-by: Tim Hu <timhu102@amd.com>
[ROCm/rccl commit: 9c0ef11ac7]
* Refactoring unit tests to improve performance
* Spawning child processes during InitComms instead of on TestBed construction
* Temporarily disabling graph unit tests
[ROCm/rccl commit: 27e0cb43c2]