Use get_closest_marker instead of get_marker (#147)

Author: icywang86rui

test/integ/test_gpu_devices.py

@@ -19,7 +19,7 @@
 
 @pytest.fixture(autouse=True)
 def skip_cpu(request, processor):
-    if request.node.get_marker('skip_cpu') and processor == 'cpu':
+    if request.node.get_closest_marker('skip_cpu') and processor == 'cpu':
         pytest.skip('Skipping because we are running cpu image.')