Add ability to pass parameters during update
Add ability to pass parameters during update

This patch add addtional option parameters for stack_update method,
which is used in integration tests.

Change-Id: If7a995616dc5b8fbf342e324f2355df17a1adeba

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