Errata counts aren't similar between the content-hosts view and the export csv
Description of problem:
`Export` CSV from content hosts page do not match the errata count from the web UI
Steps to Reproduce:
1. GoTo Hosts -> Content Host
2. In the table, you will see Errata count for all hosts.
3. Click `Export` from the top. This will generate a CSV file.
4. Errata count does not match.
Errata count in the CSV are different from the web UI
Both should show the same count
WEB UI is showing installable errata whereas CSV is showing applicable errata