updates to not add video tab to non video products, and to improve logic when purchases are made and the rest call to HSS server to add access has an issue, it will retry again later

git-svn-id: https://plugins.svn.wordpress.org/woocommerce-hss-extension-for-streaming-video/trunk@815213 b8457f37-d9ea-0310-8a92-e5e31aec5664