Feat(eos_cli_config_gen): Add ethernet interface dhcp server config

[gmuloc]

Change Summary

Adding

interface Ethernet2
  dhcp server ipv4
  dhcp server ipv6

the cli is introduced between bfd and ipv6 enable as per EOS cli:

ceos2(config-if-Et2)#show active
interface Ethernet2
   ip address 1.1.1.1/24
   bfd echo
   dhcp server ipv4
   dhcp server ipv6
   ipv6 enable

Component(s) name

arista.avd.eos_cli_config_gen

How to test

molecule

Checklist

Repository Checklist

• My code has been rebased from devel before I start
• I have read the CONTRIBUTING document.
• My change requires a change to the documentation and documentation have been updated accordingly.
• I have updated molecule CI testing accordingly. (check the box if not applicable)

[ClausHolbechArista]

It would be nice to get this implemented too for port-channels and SVIs if applicable, but we can take that another day :)

[carlbuchmann]

LGTM

[pvinci-arista]

There are some caveats. Do we want to add something to the jsonschema description or somewhere else to call them out?

The DHCP Server and DHCP Relay cannot be configured on the same router. The DHCP Relay has a higher precedence so the DHCP Server will be disabled when the DHCP Relay is configured.

If DHCPD is enabled on the router, configuring the EOS DHCP Server may cause DHCPD to crash or have unexpected behaviors.