Comment 4 for bug 1378904

CONFIRMED FOR: MITAKA
$ nova-manage --version
13.0.0

# Reproduce Steps:
1) Create a HA/AZ. ie., "AZ1"
2) Add compute nodes to "AZ1" (Admin->System->Host Aggregates->Manage Hosts)
3) Launch VM in this AZ.
4) Live migrate/migrate VM - will succeed
5) Create a new HA/AZ. ie., "AZ2"
6) Remove compute nodes from "AZ1"
7) Add compute nodes to "AZ2"
8) Try to migrate VM

Fails with ERROR: Error: No valid host was found. There are not enough hosts available. compute-1: (AvailabilityZoneFilter) avail zone az1 not in host AZ: set([u'az2'])

# nova-scheduler.log
2016-11-17 21:08:38.690 168453 INFO nova.filters [req-e9cede77-e888-4553-83d6-4e112a8e44a7 59d4a769c88545acb86f646b2464f4d1 93dd4afc2ddb4bfd88d8b5d13d348998 - - -] AvailabilityZoneFilter: (compute-1) REJECT: avail zone az1 not in host AZ: set([u'az2'])

# nova show <uuid> displays correct AZ for VM
| OS-EXT-AZ:availability_zone | az2

# however nova --debug list displays in the RESP BODY:
"OS-EXT-AZ:availability_zone": "az1"

# check the VM in DB, availability_zone is still listed as 'az1' as well.