findspam.py: Extend "Bad NS" with more name servers
findspam.py: Extend "Bad NS" with more name servers

Based on fairly convincing evidence, also blacklist the following
precise combinations of name servers.

ns{1,2}.md-{95,99}.bigrockservers.com.
{apollo,liz}.ns.cloudflare.com.
{chip,lola}.ns.cloudflare.com.
{lloyd,reza}.ns.cloudflare.com.

Somewhat refactor the surrounding code to facilitate this logic.

Charcoal-SE/SmokeDetector,Charcoal-SE/SmokeDetector