object proxy
object_proxy: debug
app_manager: use object proxy
gre_tunnel: create another obj fe for portset
_CAN_PROXY for network
vsctl test code from yamahata
ovs_vsctl.py: rebase and tweaks
ovs_vsctl.py: print timing info
add a ryuapp to provide python interactive console for debugging
app_manager: don't forget to register_app RyuApp contexts