Make resource_tracker record host_ip

Now that the host_ip, for affinity_filters, is coming from the DB and
the host_ip is virt driver independent so make the resource_tracker add
it.

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

Change-Id: I498578191b0af97cb91ca0d81b7ad1eeaf8fd995
Merge "Make resource_tracker record host_ip"