Replaced mox usage with mock in test_swift
Replaced mox usage with mock in test_swift

Change-Id: I03cc9e82058c3c0dfe3e376e0d5ec90dfcf167bc
Implements: blueprint mox-to-mock-conversion

noironetworks/heat,dragorosson/heat,noironetworks/heat,openstack/heat,steveb/heat,gonzolino/heat,gonzolino/heat,dims/heat,jasondunsmore/heat,steveb/heat,cwolferh/heat-scratch,cwolferh/heat-scratch,openstack/heat,dragorosson/heat,dims/heat,jasondunsmore/heat