Make NGINX and Apache `server_name` variables lists

[gregharvey]

At the moment when you put multiple domains into server_name and you have HTTP -> HTTPS redirecting on, you get a broken vhost like this example from NGINX:

server {
    listen 80 default_server;
    server_name dummy-test2.codeenigma.net bar.dummy-test2.codeenigma.net;
    rewrite ^ https://dummy-test2.codeenigma.net bar.dummy-test2.codeenigma.net$request_uri? permanent;
...

If we had server_name as a list of server names instead of just a string, we could loop over it and create a rewrite line per domain provided.