Make Felix healthhost configurable

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

@@ -65,6 +65,8 @@ spec:
             # Set Felix endpoint to host default action to ACCEPT.
             - name: FELIX_DEFAULTENDPOINTTOHOSTACTION
               value: "{{ calico_endpoint_to_host_action|default('RETURN') }}"
+            - name: FELIX_HEALTHHOST
+              value: "{{ calico_healthhost }}"
 # should be set in etcd before deployment
 #            # Configure the IP Pool from which Pod IPs will be chosen.
 #            - name: CALICO_IPV4POOL_CIDR