datapath-windows: OvsInitTunnelVport() and OvsInitBridgeInternalVport().

In this patch, we add the init functions for a Tunnel vport and a
Bridge-internal vport.

Signed-off-by: Nithin Raju <nithin@vmware.com>
Acked-by: Alin Gabriel Serdean <aserdean@cloudbasesolutions.com>
Tested-by: Alin Gabriel Serdean <aserdean@cloudbasesolutions.com>
Signed-off-by: Ben Pfaff <blp@nicira.com>