Revert "Add support for ipv6 only cluster via "enable_ipv6only_stack_networks…"

This reverts commit 76c0a3aa75.

roles/kubespray-defaults/tasks/main.yaml

@@ -16,17 +16,7 @@
     - name: Set fallback_ip
       set_fact:
         fallback_ip: "{{ ansible_default_ipv4.address | d('127.0.0.1') }}"
-      when: fallback_ip6 is not defined
-    - name: Gather ansible_default_ipv6
-      setup:
-        gather_subset: '!all,network'
-        filter: "ansible_default_ipv6"
-      when: ansible_default_ipv6 is not defined
-      ignore_unreachable: true
-    - name: Set fallback_ip6
-      set_fact:
-        fallback_ip6: "{{ ansible_default_ipv6.address | d('::1') }}"
-      when: fallback_ip6 is not defined
+      when: fallback_ip is not defined
 
     - name: Set no_proxy
       import_tasks: no_proxy.yml

roles/kubespray-defaults/tasks/no_proxy.yml

@@ -23,7 +23,7 @@
       {%- if additional_no_proxy is defined -%}
       {{ additional_no_proxy }},
       {%- endif -%}
-      127.0.0.1,::1,localhost,{{ kube_service_addresses_range }},{{ kube_pods_subnet }},svc,svc.{{ dns_domain }}
+      127.0.0.1,localhost,{{ kube_service_addresses }},{{ kube_pods_subnet }},svc,svc.{{ dns_domain }}
   delegate_to: localhost
   connection: local
   delegate_facts: true