Fix test_adl for azure-datalake-store 1.0.1+ compatibility (#866)

The azure-datalake-store library removed the 'auth' attribute from the
lib module in version 1.0.1. Add create=True to patch.object to allow
mocking the attribute even when it doesn't exist in the module.

Author: Br1an67

papermill/tests/test_adl.py

@@ -50,7 +50,7 @@ def test_write_opens_file_and_writes_to_it(self):
         self.adl.write("hello world", "adl://foo_store.azuredatalakestore.net/path/to/file")
         self.fakeFile.write.assert_called_once_with(b"hello world")
 
-    @patch.object(adl_lib, 'auth', return_value="my_token")
+    @patch.object(adl_lib, 'auth', return_value="my_token", create=True)
     @patch.object(adl_core, 'AzureDLFileSystem', return_value="my_adapter")
     def test_create_adapter(self, azure_dl_filesystem_mock, auth_mock):
         sut = ADL()