fix for API changes in netbox removing display_name

vyos.conf.j2

@@ -177,7 +177,7 @@ interfaces {
 {% for iface_name, iface_data in pillar['netbox']['interfaces'].items() %}{% if iface_data['mgmt_only'] %}
 {% elif iface_name == 'lo' %}
     loopback lo {
-        description "{{ iface_data['description'].replace('"','\\"') or "-" }}{% if iface_data['connected_endpoint'] and iface_data['connected_endpoint']['device'] %} ({% if iface_data['connected_endpoint']['device'] %}{{ iface_data['connected_endpoint']['name'] }} @ {{ iface_data['connected_endpoint']['device']['display_name'] }}{% endif %}){% endif %}"
+        description "{{ iface_data['description'].replace('"','\\"') or "-" }}{% if iface_data['connected_endpoint'] and iface_data['connected_endpoint']['device'] %} ({% if iface_data['connected_endpoint']['device'] %}{{ iface_data['connected_endpoint']['name'] }} @ {{ iface_data['connected_endpoint']['device']['display'] }}{% endif %}){% endif %}"
         {% for address in iface_data['addresses'] %}
         address {{ address['address'] }}
         {% endfor %}        
@@ -194,7 +194,7 @@ interfaces {
     }
 {% elif iface_data.get('type',{}).get('label','') != 'Virtual' %}
     ethernet {{ iface_name }} {
-        description "{{ iface_data['description'].replace('"','\\"') or "-" }}{% if iface_data['connected_endpoint'] and iface_data['connected_endpoint']['device'] %} ({% if iface_data['connected_endpoint']['device'] %}{{ iface_data['connected_endpoint']['name'] }} @ {{ iface_data['connected_endpoint']['device']['display_name'] }}{% endif %}){% endif %}"
+        description "{{ iface_data['description'].replace('"','\\"') or "-" }}{% if iface_data['connected_endpoint'] and iface_data['connected_endpoint']['device'] %} ({% if iface_data['connected_endpoint']['device'] %}{{ iface_data['connected_endpoint']['name'] }} @ {{ iface_data['connected_endpoint']['device']['display'] }}{% endif %}){% endif %}"
         {% if 'vrf' in salt['pillar.get']('interfaces:'+iface_name,{}) %}vrf {{ salt['pillar.get']('interfaces:'+iface_name+':vrf') }}{% endif %}
         {% for address in iface_data['addresses'] %}
         address {{ address['address'] }}