Next gen AA implemented and small cleanup

* next gen anti affinity support implemented;
* it supports scaling too;
* small code cleanup.

Implements blueprint anti-affinity-ng

Change-Id: Id59e229b730bcb9d1e676c348f4c2ad4bf8c66c8
Updated guide for dev environment.

Partially implements blueprint docs-for-v02

Change-Id: I567a257346ff7064637019e1e6b470e5c004b513
Merge "Next gen AA implemented and small cleanup"
Merge "Updated guide for dev environment."