style: format python files with isort and double-quote-string-fixer

examples/system/ulp/example_test.py

@@ -1,8 +1,10 @@
 from __future__ import unicode_literals
-from tiny_test_fw import Utility
+
 import re
 import time
+
 import ttfw_idf
+from tiny_test_fw import Utility
 
 
 @ttfw_idf.idf_example_test(env_tag='Example_GENERIC')