bonding: use exit_batch_rtnl() method

exit_batch_rtnl() is called while RTNL is held,
and devices to be unregistered can be queued in the dev_kill_list.

This saves one rtnl_lock()/rtnl_unlock() pair,
and one unregister_netdevice_many() call.

v2: Added bond_net_pre_exit() method to make sure bond_destroy_sysfs()
    is called before we unregister the devices in bond_net_exit_batch_rtnl
 (Antoine Tenart : https://lore.kernel.org/netdev/170688415193.5216.10499830272732622816@kwain/)

Signed-off-by: Eric Dumazet <[email protected]>
Acked-by: Jay Vosburgh <[email protected]>
Cc: Andy Gospodarek <[email protected]>
Reviewed-by: Antoine Tenart <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Jakub Kicinski <[email protected]>

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