Revert "Also set nova::network::neutron::dhcp_domain"
Revert "Also set nova::network::neutron::dhcp_domain"

This reverts commit 12aaf4b54c7dfe2e5e3044882af78bb340a5d63c.

Change-Id: I8b797d402657d18669f6c3c28d822605ce7e1035

openstack/tripleo-heat-templates,openstack/tripleo-heat-templates