Support multiple default schedule availability zones for OpenStack Compute (nova)

I updated the description of this blueprint because previously generated a lot of confusion about the goal. The goal of this blueprint is to have multiple schedule availability zones as default instead only one. This means: deprecate "default_schedule_zone" configuration option and have instead "default_schedule_z...

Multi-tenancy isolation only schedule instances in selected aggregates for OpenStack Compute (nova)

The implementation of the blueprint “Multi-tenancy isolation with aggregates” defines that: “If a host doesn't belongs to any aggregate it can create instances from all tenants. Also, if a host belongs to aggregates that don't define the metadata filter_tenant_id it can create instances from all tenants.” This use ...