Add possibily to set availability_zone

Change-Id: Ib62713f67e0d1e267590210d331de19da58f8015
Related-PROD: DEVCLOUD-506
(cherry picked from commit 50a66c654627599bd47b9738463cc02f76c09956)
diff --git a/metadata/service/manager/single.yml b/metadata/service/manager/single.yml
index 13713b0..4bde8bb 100644
--- a/metadata/service/manager/single.yml
+++ b/metadata/service/manager/single.yml
@@ -7,6 +7,7 @@
     keystone_octavia_endpoint_type: internal
     octavia_loadbalancer_topology: 'SINGLE'
     octavia_hm_bind_port: 5555
+    octavia_amphora_availability_zone: 'nova'
   octavia:
     manager:
       enabled: true
@@ -55,3 +56,5 @@
         controller_ip_port_list: ${_param:octavia_hm_bind_ip}:${_param:octavia_hm_bind_port}
       house_keeping:
         spare_amphora_pool_size: 0
+      nova:
+        availability_zone: ${_param:octavia_amphora_availability_zone}