Remove mock.patch.stop from tests that inherit from BaseTestCase
Remove mock.patch.stop from tests that inherit from BaseTestCase

The tests that inherit from BaseTestCase don't need to stop their
patches, since this is already done in the base class

Change-Id: Ibb1183e521686d6e948046997b32f4044d91d9e7
Closes-bug: #1305656

moshele/old-networking-mlnx