Availability zone affinity anti affinity filter

Currently, affinity and anti affinity filter scopes servers in a server group across hosts(anti affinity) or in a single host(affinity). This blueprint proposes affinity and anti affinity filter within availability zones. Servers in a server group with affinity can be scheduled on hosts within an availability zone. Servers in a server group with ani affinity policy will be scheduled on hosts across distinct availability zones. It results in higher availability for servers across multiple zones. Servers schedule within a zone will have lower latency.