Make affinity_filters use host_ip from DB not RPC

Instead of using host_ip from capabilities, which are being removed, get the
host_ip from the same place the rest of scheduling information comes
from, the database.

Part of bp no-compute-fanout-to-scheduler

Change-Id: I56a1cbb1903c20b347469d0ee5a8c6d89a21c44e
Merge "Make affinity_filters use host_ip from DB not RPC"