Add tests for list_stacks and count_stacks params
Add tests for list_stacks and count_stacks params

There are no tests for show_deleted and show_nested
params in list_stacks and no test for show_deleted
param in count_stacks. Methods' return depends on
these params, so this patch test correct using of
these params.

Change-Id: I08a68ac7c1b1f5abeeadf8563a6b347ecee6e369
miguelgrinberg/heat,steveb/heat,srznew/heat,steveb/heat,cryptickp/heat,pratikmallya/heat,rh-s/heat,noironetworks/heat,takeshineshiro/heat,rdo-management/heat,cwolferh/heat-scratch,cryptickp/heat,jasondunsmore/heat,openstack/heat,maestro-hybrid-cloud/heat,pshchelo/heat,maestro-hybrid-cloud/heat,pshchelo/heat,dims/heat,openstack/heat,gonzolino/heat,pratikmallya/heat,rh-s/heat,srznew/heat,jasondunsmore/heat,takeshineshiro/heat,rdo-management/heat,cwolferh/heat-scratch,gonzolino/heat,miguelgrinberg/heat,noironetworks/heat,dragorosson/heat,dims/heat,dragorosson/heat