Removed unused method in test_folder.py
Removed unused method in test_folder.py

Issues:
Addresses comment in PR #170.

Problem:
Unused function definition in the functional test for the Folder object.

Analysis:
* Remove the unused method.

Tests:
* Reran the functional tests, all pass

F5Networks/f5-common-python,F5Networks/f5-common-python,wojtek0806/f5-common-python