allow the cmd installer to load the config file from '/etc/gnusocial/config.d/'.$_server.'.php'

using the commandline argument as $_server (passed through lib/common.php to lib/gnusocial.php)

lib/installer.php

@@ -517,6 +517,9 @@ abstract class Installer
      */
     function registerInitialUser()
     {
+        // initalize hostname from install arguments, so it can be used to find
+        // the /etc config file from the commandline installer
+        $server = $this->server;
         require_once INSTALLDIR . '/lib/common.php';
 
         $data = array('nickname' => $this->adminNick,