lib/nova: Move 'novncproxy_host' to 'vnc' group

This option was moved in '11a42d4'. Move it, fixing the deprecation
warning in the process.

Change-Id: I567a04f6201695f1ca0d0919b1d1f769bad05964
diff --git a/lib/nova b/lib/nova
index cce538d..1ed8449 100644
--- a/lib/nova
+++ b/lib/nova
@@ -575,7 +575,7 @@
         iniset $NOVA_CONF vnc enabled true
         iniset $NOVA_CONF vnc vncserver_listen "$VNCSERVER_LISTEN"
         iniset $NOVA_CONF vnc vncserver_proxyclient_address "$VNCSERVER_PROXYCLIENT_ADDRESS"
-        iniset $NOVA_CONF DEFAULT novncproxy_host "$NOVA_SERVICE_LISTEN_ADDRESS"
+        iniset $NOVA_CONF vnc novncproxy_host "$NOVA_SERVICE_LISTEN_ADDRESS"
         iniset $NOVA_CONF vnc xvpvncproxy_host "$NOVA_SERVICE_LISTEN_ADDRESS"
     else
         iniset $NOVA_CONF vnc enabled false