Skip ASN checks on subdomains (& .format() index)
Skip ASN checks on subdomains (& .format() index)

Updates whitelist from simple naive checks to triplee's
suggested detection based on hostname + any subdomain.hostname
checks.

Tested with pytest; still skips exact whitelist matches
(ffmpeg.org), subdomain matches (noexist.ffmpeg.org), and catches bad
ASNs (www.siliconflip.com).

Also fixes an index error on the debug message.

Charcoal-SE/SmokeDetector,Charcoal-SE/SmokeDetector