Set 'PUBLIC_INTERFACE' in local.conf, so the code will
be entered into _move_neutron_addresses_route of
neutron-legacy.
But if lack of sudo to run command arping, the information
"arping: socket: Operation not permitted" occurs. So add
'sudo' for 'ARP_CMD' of lib/neutron-legacy.
Change-Id: I8ac8a9bc2bbba049c45b28bf9b93d9a10e398fe6
Closes-Bug: #1783046