Cleanup dead code
Cleanup dead code

Remove parameter to configure ODL DHCP services as it is recommended
to not use it and is disabled from ODL side.

Change-Id: I695b558a9a68dde92557d86967906172815623a5

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