Remove unused Stack data method
Remove unused Stack data method

Change-Id: Ia3fce29a58957b84f2eba33ac1b2ecfb04543939

rdo-management/python-heatclient,jasondunsmore/python-heatclient,larsks/python-heatclient,metacloud/python-heatclient,citrix-openstack-build/python-heatclient,varunarya10/python-heatclient,ecerulm/python-heatclient,larsks/python-heatclient,metacloud/python-heatclient,jasondunsmore/python-heatclient,rdo-management/python-heatclient,citrix-openstack-build/python-heatclient,tcpcloud/python-heatclient,openstack/python-heatclient,varunarya10/python-heatclient,ecerulm/python-heatclient,tcpcloud/python-heatclient