perfdhcp enhancements: relayed v6 options
perfdhcp has limited support for testing relayed DHCP traffic.
The "-J" command line option may be used with DHCPv4 for testing shared networks,
and the "-A" command line option can be used to simulate encapsulation in DHCPv6.
It could be useful, for Kea users to be able to test relayed DHCP traffic by,
for example, being able to define and process relay agent information.