Set allow_availability_zone_fallback option

Change-Id: If1de3f1e11fad4f90b4375ce17987b3b3ea59bd0
diff --git a/cinder/files/kilo/cinder.conf.controller.Debian b/cinder/files/kilo/cinder.conf.controller.Debian
index 5f723fe..ce89626 100644
--- a/cinder/files/kilo/cinder.conf.controller.Debian
+++ b/cinder/files/kilo/cinder.conf.controller.Debian
@@ -21,6 +21,7 @@
 debug=False
 
 os_region_name={{ controller.identity.region }}
+allow_availability_zone_fallback = {{ controller.get('availability_zone_fallback', True) }}
 
 #glance_api_ssl_compression=False
 #glance_api_insecure=False
diff --git a/cinder/files/liberty/cinder.conf.controller.Debian b/cinder/files/liberty/cinder.conf.controller.Debian
index 4625b38..14c9213 100644
--- a/cinder/files/liberty/cinder.conf.controller.Debian
+++ b/cinder/files/liberty/cinder.conf.controller.Debian
@@ -21,6 +21,7 @@
 debug=False
 
 os_region_name={{ controller.identity.region }}
+allow_availability_zone_fallback = {{ controller.get('availability_zone_fallback', True) }}
 
 #glance_api_ssl_compression=False
 #glance_api_insecure=False