Changes to support Dual Stack networking

roles/network_plugin/calico/templates/calico-node.yml.j2

@@ -200,9 +200,8 @@ spec:
 {% endif %}
             - name: CALICO_IPV4POOL_IPIP
               value: "{{ calico_ipv4pool_ipip }}"
-            # Disable IPv6 on Kubernetes.
             - name: FELIX_IPV6SUPPORT
-              value: "false"
+              value: "{{ enable_dual_stack_networks | default(false) }}"
             # Set Felix logging to "info"
             - name: FELIX_LOGSEVERITYSCREEN
               value: "{{ calico_loglevel }}"
@@ -239,6 +238,10 @@ spec:
             - name: IP
               value: "autodetect"
 {% endif %}
+{% if enable_dual_stack_networks %}
+            - name: IP6
+              value: autodetect
+{% endif %}
 {% if calico_use_default_route_src_ipaddr|default(false) %}
             - name: FELIX_DEVICEROUTESOURCEADDRESS
               valueFrom: