Remove suspended & installing fields, replace with single status field

app/Http/Controllers/Admin/Servers/ServerViewController.php

@@ -207,7 +207,7 @@ class ServerViewController extends Controller
      */
     public function manage(Request $request, Server $server)
     {
-        if ($server->installed > 1) {
+        if ($server->status === Server::STATUS_INSTALL_FAILED) {
             throw new DisplayException(
                 'This server is in a failed install state and cannot be recovered. Please delete and re-create the server.'
             );