Do not load PingItems, threads have to user their own ctx anyway

ISPChk/NetworkTest.cs

@@ -152,8 +152,6 @@ namespace ISPChk
         public void AddHost(Host host)
         {
             System.Diagnostics.Debug.WriteLine("Host added!");
-            if (host.PingItems == null)
-                host = _context.Hosts.Include(host => host.PingItems).Where(h => h.HostId == host.HostId).Single();
             if(host.Ping)
                 StartPing(host);
         }