Fix past standard_library hook test.

The test framework here calls remove_hook() from past, but the test
installs hooks from future, so they bleed through.

Author: QuLogic

past/tests/test_translation.py

@@ -123,6 +123,8 @@ def test_import_future_standard_library(self):
         """
         module = self.write_and_import(code, 'future_standard_library')
         self.assertTrue('configparser' in dir(module))
+        from future import standard_library
+        standard_library.remove_hooks()
 
     def test_old_builtin_functions(self):
         code = """