Update hostsfile and add zerotier cookbook

cookbooks/zerotier/COPYING

@@ -0,0 +1,17 @@
+ZeroTier One, an endpoint server for the ZeroTier virtual network layer.
+Copyright © 2011–2016 ZeroTier, Inc.
+
+ZeroTier One is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 3 of the License, or (at
+your option) any later version.
+
+See the file ‘LICENSE.GPL-3’ for the text of the GNU GPL version 3.
+If that file is not present, see <http://www.gnu.org/licenses/>.
+
+..
+    Local variables:
+    coding: utf-8
+    mode: text
+    End:
+    vim: fileencoding=utf-8 filetype=text :