Group issues into categories based on requirement and include positive validation

[lgarron]

That is, show at least one success, warning, or error message for each of the following:

1. Certificate/HTTP connectivity
2. HTTP redirect (if port 80 responds)
3. Subdomains (www)
4. HSTS Header

This way, we can always show 4 bullets for very page, similar to how the Chrome security panel always shows 3 main bullets. Otherwise, the errors are sort of a black bocks.