Add live VNC information to domain output

Sets in the node daemon, returns via the API, and shows in the CLI,
information about the live VNC listen address and port for VNC-enabled
VMs.

Closes #115

daemon-common/vm.py

@@ -207,6 +207,7 @@ def define_vm(zk_conn, config_data, target_node, node_limit, node_selector, node
         '/domains/{}/consolelog'.format(dom_uuid): '',
         '/domains/{}/rbdlist'.format(dom_uuid): formatted_rbd_list,
         '/domains/{}/profile'.format(dom_uuid): profile,
+        '/domains/{}/vnc'.format(dom_uuid): '',
         '/domains/{}/xml'.format(dom_uuid): config_data
     })