fix removing gateways

Author: sjpb

ansible/roles/gateway/files/gateway-init.yml

@@ -53,15 +53,17 @@
 
     - name: Remove undesired gateways
       shell: |
-        nmcli connection modify '{{ item.connection }}' ipv4.gateway ''
+        nmcli connection modify '{{ item.connection }}' \
+          ipv4.never-default yes \
+          ipv6.never-default yes
         nmcli connection up '{{ item.connection }}'
       when:
         - gateway_ip != ''
         - item.ip4_gateway != ''
         - item.connection != gateway_ip_connection
       loop: "{{ nmcli_devices }}"
 
-    - name: Add desired gateways # TESTED OK
+    - name: Add desired gateways
       shell: |
         nmcli connection modify '{{ item.connection }}' \
           ipv4.address {{ item.ip4_address }} \