Add possibily to set availability_zone

Change-Id: Ib62713f67e0d1e267590210d331de19da58f8015
Related-PROD: DEVCLOUD-422
diff --git a/metadata/service/api/cluster.yml b/metadata/service/api/cluster.yml
index f6bd55e..f907f09 100644
--- a/metadata/service/api/cluster.yml
+++ b/metadata/service/api/cluster.yml
@@ -9,6 +9,7 @@
     octavia_api_bind_port: 9876
     octavia_api_v1_enabled: True
     octavia_api_v2_enabled: True
+    octavia_amphora_availability_zone: 'nova'
   octavia:
     api:
       enabled: true
@@ -42,3 +43,5 @@
         user: openstack
         password: ${_param:rabbitmq_openstack_password}
         virtual_host: '/openstack'
+      nova:
+        availability_zone: ${_param:octavia_amphora_availability_zone}