Remove allow_overlapping_ips configuration option

This option was removed from Neutron in the Zed release [1]. This can be
backported to Yoga where the default value was changed to True [2].

[1] https://review.opendev.org/c/openstack/neutron/+/837286
[2] https://review.opendev.org/c/openstack/neutron/+/807848

Change-Id: Ibcd81a3a5f4b8de60459b3a4cfc30a50a06a436f

ansible/roles/neutron/templates/neutron.conf.j2

@@ -38,8 +38,6 @@ ovs_integration_bridge = br-int-{{ item }}
 host = {{ ansible_facts.hostname }}_{{ item }}
 {% endif %}
 
-allow_overlapping_ips = true
-
 {% if neutron_plugin_agent == 'vmware_nsxv' %}
 core_plugin = vmware_nsx.plugin.NsxVPlugin
 {% elif neutron_plugin_agent == 'vmware_nsxv3' %}