kvm: also use "auto=1" in url-additional

This change is related to 11210de0.

software/kvm/buildout.hash.cfg

@@ -19,7 +19,7 @@ md5sum = a236b719aaac61ac342ada0ce569151a
 
 [template-kvm]
 filename = instance-kvm.cfg.jinja2
-md5sum = fd0b26e5ae200ce2f7ee2a169731998c
+md5sum = 380753649a1ad289d2b3d63d7c70409b
 
 [template-kvm-cluster]
 filename = instance-kvm-cluster.cfg.jinja2.in

software/kvm/instance-kvm.cfg.jinja2

@@ -493,7 +493,7 @@ ipv6 = ${slap-network-information:global-ipv6}
 backend-url = https://[${novnc-instance:ip}]:${novnc-instance:port}/vnc.html?auto=1&encrypt=1&password=${kvm-controller-parameter-dict:vnc-passwd}
 url = ${request-slave-frontend:connection-secure_access}/vnc.html?auto=1&encrypt=1&password=${kvm-controller-parameter-dict:vnc-passwd}
 {% if additional_frontend %}
-url-additional = ${request-slave-frontend-additional:connection-secure_access}/vnc.html?host=${request-slave-frontend-additional:connection-domain}&port=${frontend-additional-port:port}&encrypt=1&password=${kvm-controller-parameter-dict:vnc-passwd}
+url-additional = ${request-slave-frontend-additional:connection-secure_access}/vnc.html?auto=1&encrypt=1&password=${kvm-controller-parameter-dict:vnc-passwd}
 {% endif %}
 {% set disk_number = len(storage_dict) -%}
 maximum-extra-disk-amount = {{ disk_number }}