fixes #7666, #7667, #7668 - errata mail notifications

You would not have a situation like that: available is a subset of applicable.

The report shows available as the first number, and the second as applicable.  So as an administrator, I get an e-mail that tells me my host has 3 available errata -- that I can apply yum update right now and get.  

The second number is a heads up there's new content in the Library coming up the pipeline to my host, and I may want to check those out -- especially if it's security.  It's not useful if that number includes available too.