When FWaaS v1 or v2 are used, there is a need to add FW rules
to allow the dhcp traffic to the relay server.
Those rules are added to the firewall before the default deny rule.
In case of FWaaS v2 - for each port separately.
The admin utility handling a change in the DHCP relay configuration
will now update the rules as well.
Change-Id: I30e666085fe5cdf17d48984518c73f79bf8cdf55
96c1e57a7f