Added tests for pseudo params
Added tests for pseudo params

To cover 'OS::stack_id' and 'OS::stack_name'.

Change-Id: Idbaf867f71feacb4a1f382eb7233fb69517603a9

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