[dtests] refactor windows specific changes (#1313)

* [dtests] refactor windows specific changes

* Refactor hipMemoryAllocateCoherentDriver - PR- 1309

* Fix missing z in _putenv_s

* Revert "Fix missing z in _putenv_s"

This reverts commit 099a1b20a5c75c5f122d57c0ad2bca01745cdc9c.

* Refactor changes from PR 1299

* Update hipEnvVarDriver.cpp

tests/src/hipEnvVarDriver.cpp

@@ -30,13 +30,7 @@ OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWA
 #include "hip/hip_runtime.h"
 #include <chrono>
 #include <thread>
-
-#ifdef _WIN64
-#define popen(x,y) _popen(x,y)
-#define pclose(x) _pclose(x)
-#define setenv(x,y,z) _putenv_s(x,y)
-#define unsetenv(x) _putenv_s(x,"")
-#endif
+#include "test_common.h"
 
 using namespace std;