Design API for shared Anti-Affinity Policies operations

[push1st1k]

It would be great to design set of API calls and structures that will allow to provide possibilities to manage Anti-Affinity Policies.

Proposed set of required to implementation APIs:

1. Create Anti-Affinity Policy
2. Update Anti-Affinity Policy
3. Search Anti-Affinity Policies
4. Delete Anti-Affinity Policy
5. Add support of Anti-Affinity Policy to Create Server Operation