Add several domains (#3758)

* cleanup spaces

* mozilla: add thundermail domains

* godaddy: add godaddy.net and wsimg.com

* category-vpnservices: add dfvpn.com

* category-ecommerce: add gamewtb.com

data/category-vpnservices

@@ -29,6 +29,7 @@ cloudn.me
 conair.me
 cordcloud.org
 ctyun.online
+dfvpn.com
 geph.io
 gfw.press
 maying.co