Cinder: update osapi_volume_extension default.

Updates the Cinder config file to use the new extension
loader location.

Change-Id: I515e16e00b54c69ae3c09e64841818eb4a9c8f73
diff --git a/lib/cinder b/lib/cinder
index a730cd6..5f4f979 100644
--- a/lib/cinder
+++ b/lib/cinder
@@ -172,7 +172,7 @@
     iniset $CINDER_CONF DEFAULT sql_connection $dburl
     iniset $CINDER_CONF DEFAULT api_paste_config $CINDER_API_PASTE_INI
     iniset $CINDER_CONF DEFAULT root_helper "sudo ${CINDER_ROOTWRAP}"
-    iniset $CINDER_CONF DEFAULT osapi_volume_extension cinder.api.openstack.volume.contrib.standard_extensions
+    iniset $CINDER_CONF DEFAULT osapi_volume_extension cinder.api.contrib.standard_extensions
     iniset $CINDER_CONF DEFAULT state_path $CINDER_STATE_PATH
 
     if is_service_enabled tls-proxy; then