Revise private_data_dir fixture to see if it improves code coverage

Author: djyasin

awx/main/tests/unit/tasks/test_jobs.py

@@ -27,8 +27,7 @@ def private_data_dir():
     private_data = tempfile.mkdtemp(prefix='awx_')
     for subfolder in ('inventory', 'env'):
         runner_subfolder = os.path.join(private_data, subfolder)
-        if not os.path.exists(runner_subfolder):
-            os.mkdir(runner_subfolder)
+        os.makedirs(runner_subfolder, exist_ok=True)
     yield private_data
     shutil.rmtree(private_data, True)