refine_mock_torch (#10396)

重构 mock_torch 模块

ci/test/test_mock_script.sh

@@ -1,5 +1,12 @@
 #!/bin/bash
 set -e
+python_version=$(python3 --version 2>&1 | awk '{print $2}')
+
+if [[ "$python_version" < "3.8" ]]; then
+    echo "Python version is less than 3.8."
+    exit 0
+fi
+
 MOCK_TORCH=$PWD/python/oneflow/test/misc/mock_example.py
 
 same_or_exit() {
@@ -56,4 +63,4 @@ python3 -c "import oneflow as flow; x = flow.load('test.pt'); assert flow.equal(
 rm test.pt
 
 eval $(python3 -m oneflow.mock_torch --lazy --verbose)
-python3 -c "import torch.not_exist" | grep -q 'dummy object'
+python3 -c "import torch.not_exist" | grep -q 'dummy object'