Handle SANs

generate.py

     networks = fetcher.get_networks(container)
     services.append({
       'protocol': 'http', # TODO: Support HTTPS
-      'vhost': domains[container], # TODO: Handle SANs
+      'vhosts': domains[container].split(','),
       'host': next(iter(networks.values())), # TODO: Pick a bridge sensibly?
       'port': values      
     })

nginx.tpl

 {% for service in services %}
 server {
-    server_name {{ service.vhost }};
+    server_name {{ ' '.join(service.vhosts) }};
     listen [::]:443 ssl http2;
 
     location / {