added missing lincense headers

tests/unit/common/test_common_misc.py

@@ -1,3 +1,6 @@
+# Copyright (c) Microsoft Corporation. All rights reserved.
+# Licensed under the MIT License.
+
 import os
 from pathlib import Path
 from utils_cv.common.misc import copy_files, set_random_seed

tests/unit/common/test_common_plot.py

@@ -1,3 +1,6 @@
+# Copyright (c) Microsoft Corporation. All rights reserved.
+# Licensed under the MIT License.
+
 from pathlib import Path
 import matplotlib.pyplot as plt
 from utils_cv.common.plot import line_graph, show_ims