/** \brief Initialize a new tap interface with the given paramters
@param client_index - opaque cookie to identify the sender
@param context - sender context, to match reply w/ request
- @param id - interface id, 0xffff means auto
+ @param id - interface id, 0xffffffff means auto
@param use_random_mac - let the system generate a unique mac address
@param mac_address - mac addr to assign to the interface if use_radom not set
@param tx_ring_sz - the number of entries of TX ring