+ DHCP-Leases tab

There's still some unnecessary bits left

Closes: #657

Closes #524

Ports in the service-compound are currently excluded
in the join based on the vlan being member of the
service_1_cn+cs compound. This must be manually
maintained. Once ou2p_port is implemented the joins
will be more clear and won't produce false positive
includes.

Closes #702

Closes #705