Send DLNA devices message to only the matched interface

This will be the right way for multiple interfaces, or the client will
receive all devices message with different IP addresses and could not
detect which one could access.

And provide one option DlnaOptions.SendOnlyMatchedHost to fallback to old
behaviour if this commit missed something.

MediaBrowser.Model/Net/IpAddressInfo.cs

@@ -10,6 +10,7 @@ namespace MediaBrowser.Model.Net
         public static IpAddressInfo IPv6Loopback = new IpAddressInfo("::1", IpAddressFamily.InterNetworkV6);
 
         public string Address { get; set; }
+        public IpAddressInfo SubnetMask { get; set; }
         public IpAddressFamily AddressFamily { get; set; }
 
         public IpAddressInfo(string address, IpAddressFamily addressFamily)