In this patch, the ServerGroupPayload is updated to include
the new ``policy`` field; the ``policies`` field is deprecated
for removal but still put into the notification payload for
backward compatibility.
Related to blueprint complex-anti-affinity-policies
Change-Id: Ie739ee8dec4685cd70e735ff83f7f30bc7e95a57
This patch refactors the sample files of server_group notifications to
use a common ServerGroupPayload sample data.
Change-Id: I4e7531c180484a7b430d267153d185f1006543f0
Yikun Jiang