Remove availability_zones from service table

This is the final step in enabling availability_zones using aggregate
metadata. Previously all services had an availability_zone, but the
availability_zone is only used for nova-compute.  Services such as
nova-scheduler, nova-network, nova-conductor have always spanned all
availability_zones.

After this change only compute nodes (nova-compute), will have an
availability_zone. In order to preserve current APIs, when running:
* nova host-list (os-hosts)
* euca-describe-availability-zones verbose
* nova-manage service list
Internal services will appear in there own internal availability_zone
(CONF.internal_service_availability_zone)
Internal zone is hidden in euca-describe-availability_zones
(non-verbose)

CONF.node_availability_zone has been renamed to
CONF.default_availability_zone and is only used by the nova-api and
nova-scheduler. CONF.node_availability_zone still works but is
deprecated

DocImpact

Completes blueprint aggregate-based-availability-zones

Change-Id: Ib772df5f9ac2865f20df479f8ddce575a9ce3aff

bin/nova-manage

@@ -70,6 +70,7 @@ if os.path.exists(os.path.join(POSSIBLE_TOPDIR, 'nova', '__init__.py')):
 gettext.install('nova', unicode=1)
 
 from nova.api.ec2 import ec2utils
+from nova import availability_zones
 from nova.compute import instance_types
 from nova.compute import rpcapi as compute_rpcapi
 from nova import config
@@ -626,6 +627,7 @@ class ServiceCommands(object):
         ctxt = context.get_admin_context()
         now = timeutils.utcnow()
         services = db.service_get_all(ctxt)
+        services = availability_zone.set_availability_zones(ctxt, services)
         if host:
             services = [s for s in services if s['host'] == host]
         if service:
@@ -741,6 +743,7 @@ class HostCommands(object):
         ctxt = context.get_admin_context()
         now = timeutils.utcnow()
         services = db.service_get_all(ctxt)
+        services = availability_zones.set_availability_zones(ctxt, services)
         if zone:
             services = [s for s in services if s['availability_zone'] == zone]
         hosts = []