Add two new domain names for the signal service

The two new domains are:
* chat.signal.org
* ud-chat.signal.org

Change the relay destination to chat.signal.org as the preferred
domain for reaching the signal service.

data/nginx-relay/nginx.conf

@@ -1,4 +1,3 @@
-
 user  nginx;
 worker_processes  auto;
 
@@ -9,22 +8,24 @@ events {
 
 stream {
     map $ssl_preread_server_name $name {
-        textsecure-service.whispersystems.org	signal-service;
-	storage.signal.org			storage-service;
-	cdn.signal.org				signal-cdn;
-	cdn2.signal.org				signal-cdn2;
-	api.directory.signal.org		directory;
-	contentproxy.signal.org			content-proxy;
-	uptime.signal.org			uptime;
-	api.backup.signal.org                   backup;
+        chat.signal.org                         signal-service;
+        ud-chat.signal.org                      signal-service;
+        textsecure-service.whispersystems.org   signal-service;
+        storage.signal.org                      storage-service;
+        cdn.signal.org                          signal-cdn;
+        cdn2.signal.org                         signal-cdn2;
+        api.directory.signal.org                directory;
+        contentproxy.signal.org                 content-proxy;
+        uptime.signal.org                       uptime;
+        api.backup.signal.org                   backup;
         sfu.voip.signal.org                     sfu;
         updates.signal.org                      updates;
         updates2.signal.org                     updates2;
-        default					deny;
+        default                                 deny;
     }
 
     upstream signal-service {
-         server textsecure-service.whispersystems.org:443;
+         server chat.signal.org:443;
     }
 
     upstream storage-service {
@@ -48,7 +49,7 @@ stream {
     }
 
     upstream backup {
-	server api.backup.signal.org:443;
+        server api.backup.signal.org:443;
     }
 
     upstream sfu {
@@ -70,7 +71,7 @@ stream {
     server {
         listen                4433;
         proxy_pass            $name;
-        ssl_preread	      on;
+        ssl_preread           on;
         error_log             /dev/null;
         access_log            off;
      }