Remove useless mocking in tests/unit/test_shade.py
Remove useless mocking in tests/unit/test_shade.py

It only makes the tests run slower and it's confusing.

Change-Id: I1b4b92ddecf74648727759d4e60fc030a5c5e167

stackforge/python-openstacksdk,openstack/python-openstacksdk,stackforge/python-openstacksdk,dtroyer/python-openstacksdk,dtroyer/python-openstacksdk,openstack/python-openstacksdk,openstack-infra/shade,openstack-infra/shade