fix changing the policy file of heat
fix changing the policy file of heat

heat removed the stacks global index rule
which defaults to deny everybody
vitrage needs to change it
fix it so it will replace or add the rule
instead of just replacing the old rule

Depends-On: I428d04598910edfe67e8b8deb608bcf1233d672d
Change-Id: I125f0f15aebe2a0a09dba4b18312b857ce40b6ad

openstack/vitrage,openstack/vitrage,openstack/vitrage