fix(configuration): omit interface-name when not explicitly provided to avoid predictable naming mismatch

roles/configuration/templates/network.j2

@@ -2,7 +2,10 @@
 id=LAN-{{ idx }}
 uuid={{ configuration_net_uuid }}
 type=ethernet
+autoconnect-priority=10
+{% if configuration_iface_name | length > 0 %}
 interface-name={{ configuration_iface_name }}
+{% endif %}
 
 [ipv4]
 {% set iface = configuration_iface %}