[dtest] Enhanced tests for hipGetDeviceCount hipSetDevice and hipGetDevice
[dtest] Enhanced tests for hipGetDeviceCount hipSetDevice and hipGetDevice

Added following functional and negative scenario tests for
HIP_VISIBLE_DEVICES (HVD), ROCR_VISIBLE_DEVICES (RVD)
CUDA_VISIBLE_DEVICES(CVD)
1. Verifying HVD and RVD - invalid number in sequence
2. Verifying HVD and RVD - dupliates in the beginning of sequence
3. Verifying HVD and RVD - all the duplicates
4. Device count with RVD(max devices and HVD(min devices)
5. Device count with RVD(min devices and HVD(max devices)
6. Device count - RVD(set), HVD(unset), CVD(set)

SWDEV-238517 for enhancing hip unit tests

Change-Id: Ia83e9e9068cbf8cc61cff17311cda1d1f8a38fee

ROCm-Developer-Tools/HIP,ROCm-Developer-Tools/HIP,ROCm-Developer-Tools/HIP,ROCm-Developer-Tools/HIP,ROCm-Developer-Tools/HIP